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i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 1 austin semiconductor, inc. 32mx72 ddr sdram integrated plastic encapsulated microcircuit features ? ddr sdram data rate = 200, 250, 266, 333mbps ? package: ? 219 plastic ball grid array (pbga), 32 x 25mm ? 2.5v 0.2v core power supply ? 2.5v i/o (sstl_2 compatible) ? differential clock inputs (clk and clk#) ? commands entered on each positive clk edge ? internal pipelined double-data-rate (ddr) architecture; two data accesses per clock cycle ? programmable burst length: 2,4 or 8 ? bidirectional data strobe (dqs) transmitted/received with data, i.e., source-synchronous data capture (one per byte) ? dqs edge-aligned with data for reads; center-aligned with data for writes ? dll to align dq and dqs transitions with clk ? four internal banks for concurrent operation ? two data mask (dm) pins for masking write data ? programmable iol/ioh option ? auto precharge option ? auto refresh and self refresh modes ? industrial, enhanced and military temperature ranges ? organized as 32m x 72/80 ? weight: as4ddr32m72pbg i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 2 austin semiconductor, inc. sdram-ddr pinout top view dq0 dq14 dq15 vss vss a9 a10 a11 a8 vccq vccq dq16 dq17 dq31 vss dq1 dq2 dq12 dq13 vss vss a0 a7 a6 a1 vcc vcc dq18 dq19 dq29 dq30 dq3 dq4 dq10 dq11 vcc vcc a2 a5 a4 a3 vss vss dq20 dq21 dq27 dq28 dq6 dq5 dq8 dq9 vccq vssq a12 dnu dnu dnu vss vss dq22 dq23 dq26 dq25 dq7 dqml0 vcc dqmh0 dqsh3 dqsl0 dqsh0 ba0 ba1 dqsl1 dqsh1 vref dqml1 vss nc dq24 ca s0\ we0\ vcc clk0 dqsl3 ras1\ we1\ vss dqmh1 clk1 cs0\ ras0\ vcc cke0 clko\ cas1\ cs1\ vss clk1\ cke1 vss vss vcc vccq vss vcc vss vss vccq vcc vss vss vcc vccq vss vcc vss vss vccq vcc clk3\ cke3 vcc cs3\ dqsl4 clk2\ cke2 vss ras2\ cs2\ nc clk3 vcc cas3\ ras3\ dqsl2 clk2 vss we2\ cas2\ dq56 dqmh3 vcc we3\ dqml3 cke4 dqmh4 clk4 cas4\ we4\ ras4\ cs4\ dqmh2 vss dqml2 dq39 dq57 dq58 dq55 dq54 dqsh4 clk4\ dq73 dq72 dq71 dq70 dqml4 dqsh2\ dq41 dq40 dq37 dq38 dq60 dq59 dq53 dq52 vss vss dq75 dq74 dq69 dq68 vcc vcc dq43 dq42 dq36 dq35 dq62 dq61 dq51 dq50 vcc vcc dq77 dq76 dq67 dq66 vss vss dq45 dq44 dq34 dq33 vss dq63 dq49 dq48 vccq vccq dq79 dq78 dq65 dq64 vss vss dq47 dq46 dq32 vcc ground array power d/q power address data io cntrl address/dnu unpopulated
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 3 austin semiconductor, inc. functional block diagram clk1 clk1\ cke1 cs1\ we1\ ras1\ cas1\ dqml1 dqmh1 dqsl1 dqsh1 ddr sdram x16 2.5v core 2.5v io sstl-2 clk0 clk0\ cke0 cs0\ we0\ ras0\ cas0\ dqml0 dqmh0 dqsl0 dqsh0 ddr sdram x16 2.5v core 2.5v io sstl-2 clk2 clk2\ cke2 cs2\ we2\ ras2\ cas1\ dqml2 dqmh2 dqsl2 dqsh2 ddr sdram x16 2.5v core 2.5v io sstl-2 clk3 clk3\ cke3 cs3\ we3\ ras3\ cas3\ dqml3 dqmh3 dqsl3 dqsh3 ddr sdram x16 2.5v core 2.5v io sstl-2 clk4 clk4\ cke4 cs4\ we4\ ras4\ cas4\ dqml4 dqmh4 dqsl4 dqsh4 ddr sdram x16 2.5v core 2.5v io sstl-2 ba0 ba1 vref vcc vccq vss dq0-15 dq32-47 dq16- 31 dq48-63 dq64-79 addr
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 4 austin semiconductor, inc. bga locations symbol e12 vref sstl-2 reference voltage a11, a12, d5, d6, h4, h15, j4, j15, t5, t6 vccq i/o power supply a5, a6, a16, b5, b6, c11, c12, d11, d12, e14, f14, g14, h1, h2, h5, h13, h14, j1, j2, j5, j13, j14, k14, l14, p5, p6, r11. r12, t1, t11, t12, m14 vss ground (digital) b11, b12, c5, c6, e3, f3, g3, h3, h12, h16, j3, j12, j16, k3, l3, m3, p11, p12, r5, r6, t16 vcc core power supply a2, a3, a4, a13, a14, b1, b2, b3, b4, b13, b14, b15, b16, c1, c2, c3, c4, c13, c14, c15, c16, d1, d2, d3, d4, d13, d14, d15, d16, e1, e16, m1, m16, n1, n2, n3, n4, n13, n14, n15, n16, t2, t3, t4, t13, t14, t15, n7, n8, n9, n10, p7, p8, p9, p10, r7, r8, r9, r10, t7, t8, t9, t10 dq0-79 data i/o data stobe: output with read data, input with write data. dqs is edge-aligned with read data, centered in write data. it is used to capture data e6, e7, e10, e11, f5, k5, l12, n5, n12, e5 dqslx, dqshx description ckex g4, g16, k2, k13, m6 chip select: csx\ enables the command register(s) of each of the five (5) contained words. all commands are masked with csx\ is registered high. csx\ provides for external bank selection on systems with multiple banks. csx\ is considered part of the command code. csx\ g1, g13, k4, k16, m12 address input: provide the row address for active commands, and the column address and auto precharge bit (a10) for read / write commands to select one location out of the memory array in the respective bank. a10 sampled during a precharge command determines whether the precharge applies to one bank or all banks. the address inputs also provide the op-code during a mode resister set command. a0-11, a12 e8, e9 ba0, ba1 bank address inputs: ba0, ba1, define which bank an active read, write or precharge command is being applied. a7, a8, a9, a10, b7, b8, b9, b10, c7, c8. c9, c10, d7 f4, f16, g5, g15, k1, k12, l2, l13, n6, m8 ckx, ckx\ clock: ckx and ckx\ are differential clock inputs. all address and control input signals are sampled on the crossing of the positive edge of ckx and negative edge of ckx\. output data (dq's and dqs) is referenced to the crossings of the differential clock inputs. g4, g16, k2, k14, m7 rasx\, casx\, wex\ f4, f16, g5, g15, k1, k12, l2, l13, n7, m9 clock enable: cke controls the clock inputs. cke high enables, cke low disables the clock input pins. driving cke low provides precharge power-down. cke is synchronous for power-down entry and exit, and for self refresh entry cke is asynchronous for self refresh exit and for disabling the outputs. cke must be maintained high throughout read and write accesses. input buffers are disabled during power-down input buffers are disabled during self refresh. cke is an sstl-2 input but will detect an lvcmos low level after vcc is applied command inputs: rasx, casx and wex\ define the command being entered. input data mask: dm is an input mask signal for write data. input data is masked when dqmlx or hx is sampled high at time of a write access. dm is sampled on both edges of dqslx and dqshx. dqmlx, dqmhx pin definitions / functional description
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 5 austin semiconductor, inc. general description the 2.4gb ddr sdram mcm, is a high-speed cmos, dynamic random-access, memory using 5 chips containing 536,870,912 bits. each chip is internally configured as a quad-bank dram. each of the chip?s 134,217,728-bit banks is organized as 8,192 rows by 1024 columns by 32 bits. the 256mb(2.4gb) ddr sdram mcm uses a ddr architecture to achieve high-speed operation. the double data rate architecture is essentially a 2n-prefetch architecture with an interface designed to transfer two data words per clock cycle at the i/o pins. a single read or write access for the 256mb ddr sdram effectively consists of a single 2n- bit wide, one-clock-cycle data tansfer at the internal dram core and two corresponding n-bit wide, one-half-clock-cycle data transfers at the i/o pins. a bidirectional data strobe (dqs) is transmitted externally, along with data, for use in data capture at the receiver. dqs is a strobe transmitted by the ddr sdram during reads and by the memory contoller during writes. dqs is edgealigned with data for reads and center-aligned with data for writes. each chip has two data strobes, one for the lower byte and one for the upper byte. the 256mb ddr sdram operates from a differential clock (clk and clk#); the crossing of clk going high and clk# going low will be referred to as the positive edge of clk. commands (address and control signals) are registered at every positive edge of clk. input data is registered on both edges of dqs, and output data is referenced to both edges of dqs, as well as to both edges of clk. read and write accesses to the ddr sdram are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. accesses begin with the registration of an active command, which is then followed by a read or write command. the address bits registered coincident with the active command are used to select the bank and row to be accessed. the address bits registered coincident with the read or write command are used to select the bank and the starting column location for the burst access. the ddr sdram provides for programmable read or write burst lengths of 2, 4, or 8 locations. an auto precharge function may be enabled to provide a selftimed row precharge that is initiated at the end of the burst access. the pipelined, multibank architecture of ddr sdrams allows for concurrent operation, thereby providing high effective bandwidth by hiding row precharge and activation time. an auto refresh mode is provided, along with a powersaving power-down mode. functional description read and write accesses to the ddr sdram are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. accesses begin with the registration of an active command which is then followed by a read or write command. the address bits registered coincident with the active command are used to select the bank and row to be accessed (ba0 and ba1 select the bank, a0-12 select the row). the address bits registered coincident with the read or write command are used to select the starting column location for the burst access. prior to normal operation, the sdram must be initialized. the following sections provide detailed information covering device initialization, register defi nition, command descriptions and device operation. initialization ddr sdrams must be powered up and initialized in a predefined manner. operational procedures other than those specified may result in undefined operation. power must first be applied to v cc and v ccq simultaneously, and then to v ref (and to the system v tt ). v tt must be applied after v ccq to avoid device latch-up, which may cause permanent damage to the device. v ref can be applied any time after v ccq but is expected to be nominally coincident with v tt . except for cke, inputs are not recognized as valid until after v ref is applied. cke is an sstl_2 input but will detect an lvcmos low level after v cc is applied. maintaining an lvcmos low level on cke during powerup is required to ensure that the dq and dqs outputs will be in the high-z state, where they will remain until driven in normal operation (by a read access). after all power supply and reference voltages are stable, and the clock is stable, the ddr sdram requires a 200s delay prior to applying an executable command. once the 200s delay has been satisfied, a deselect or nop command should be applied, and cke should be brought high. following the nop command, a precharge all command should be applied. next a load mode register command should be issued for the extended mode register (ba1 low and ba0 high) to enable the dll, followed by another load mode register command to the mode register (ba0/ ba1 both low) to reset the dll and to program the operating parameters. two-hundred clock cycles are required between the dll reset and any read command. a precharge all command should then be applied, placing the device in the all banks idle state. once in the idle state, two auto refresh cycles must be performed (t rfc must be satisfi ed.) additionally, a load mode register command for the mode register with the reset dll bit deactivated (i.e., to program operating parameters without resetting the dll) is required. following these requirements, the ddr sdram is ready for normal operation.
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 6 austin semiconductor, inc. register definition mode register the mode register is used to define the specific mode of operation of the ddr sdram. this definition includes the selection of a burst length, a burst type, a cas latency, and an operating mode, as shown in figure 3. the mode register is programmed via the mode register set command (with ba0 = 0 and ba1 = 0) and will retain the stored information until it is programmed again or the device loses power. (except for bit a8 which is self clearing). reprogramming the mode register will not alter the contents of the memory, provided it is performed correctly. the mode register must be loaded (reloaded) when all banks are idle and no bursts are in progress, and the controller must wait the specified time before initiating the subsequent operation. violating either of these requirements will result in unspecified operation. mode register bits a0-a2 specify the burst length, a3 specifies the type of burst (sequential or interleaved), a4-a6 specify the cas latency, and a7-a12 specify the operating mode. burst length read and write accesses to the ddr sdram are burst oriented, with the burst length being programmable, as shown in figure 3. the burst length determines the maximum number of column locations that can be accessed for a given read or write command. burst lengths of 2, 4 or 8 locations are available for both the sequential and the interleaved burst types. reserved states should not be used, as unknown operation or incompatibility with future versions may result. when a read or write command is issued, a block of columns equal to the burst length is effectively selected. all accesses for that burst take place within this block, meaning that the burst will wrap within the block if a boundary is reached. the block is uniquely selected by a1-ai when the burst length is set to two; by a2-ai when the burst length is set to four (where ai is the most significant column address for a given configuration); and by a3-ai when the burst length is set to eight. the remaining (least significant) address bit(s) is (are) used to select the starting location within the block. the programmed burst length applies to both read and write bursts. burst type accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit m3. the ordering of accesses within a burst is determined by the burst length, the burst type and the starting column address, as shown in table 1. table 1 - burst definition notes: 1. for a burst length of two, a1-ai select two-data-element block; a0 selects the starting column within the block. 2. for a burst length of four, a2-ai select four-data-element block; a0-1 select the starting column within the block. 3. for a burst length of eight, a3-ai select eight-data-element block; a0-2 select the starting column within the block. 4. whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. t y pe = sequential t y pe = interleaved a0 0 0-1 0-1 1 1-0 1-0 a1 a0 0 0 0-1-2-3 0-1-2-3 0 1 1-2-3-0 1-0-3-2 1 0 2-3-0-1 2-3-0-1 1 1 3-0-1-2 3-2-1-0 a2 a1 a0 0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7 0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6 0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5 0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4 1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3 1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2 1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1 1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0 order of accesses within a burst 2 4 8 burst length starting column address read latency the read latency is the delay, in clock cycles, between the registration of a read command and the availability of the first bit of output data. the latency can be set to 2 or 2.5 clocks. if a read command is registered at clock edge n, and the latency is m clocks, the data will be available by clock edge n+m. table 2 below indicates the operating frequencies at which each cas latency setting can be used. reserved states should not be used as unknown operation or incompatibility with future versions may result. table 2 - cas latency cas cas latency=2 latency=2.5 -10 ? 75 ? 100 -8 ? 100 ? 125 -75 ? 100 ? 133 -6 ? 100 ? 166 allowable operating frequency (mhz) speed
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 7 austin semiconductor, inc. operating mode the normal operating mode is selected by issuing a mode register set command with bits a7-a12 each set to zero, and bits a0-a6 set to the desired values. a dll reset is initiated by issuing a mode register set command with bits a7 and a9-a12 each set to zero, bit a8 set to one, and bits a0-a6 set to the desired values. although not required, jedec specifications recommend when a load mode register command is issued to reset the dll, it should always be followed by a load mode register command to select normal operating mode. all other combinations of values for a7-a12 are reserved for future use and/or test modes. test modes and reserved states should not be used because unknown operation or incompatibility with future versions may result. extended mode register the extended mode register controls functions beyond those controlled by the mode register; these additional functions are dll enable/disable, output drive strength, and qfc#. these functions are controlled via the bits shown in figure 3. the extended mode register is programmed via the load mode register command to the mode register (with ba0 = 1 and ba1 = 0) and will retain the stored information until it is programmed again or the device loses power. the enabling of the dll should always be followed by a load mode register command to the mode register (ba0/ba1 both low) to reset the dll. the extended mode register must be loaded when all banks are idle and no bursts are in progress, and the controller must wait the specified time before initiating any subsequent operation. violating either of these requirements could result in unspecified operation. ba 1 ba 0 a 12 a 11 a 10 a 9 a 8 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 address bus burst length bt operating mode (ba0 and ba1 must be "0, 0" to select the base mode register (vs. the extended 0* 0* cas latency * m14 and m13 mode register). mode register (mx) m2 m1 m0 m3 = 0 m3 = 1 0 0 0 reserved reserved 0 0 1 2 2 0 1 0 4 4 0 1 1 8 8 1 0 0 reserved reserved 1 0 1 reserved reserved 1 1 0 reserved reserved 1 1 1 reserved reserved burst length 0 1 sequential interleaved m3 burst type cas latency m6 m5 m4 reserved 0 00 reserved 0 0 1 2 0 1 0 reserved 0 1 1 reserved 1 0 0 reserved 1 0 1 2.5 1 1 0 reserved 1 1 1 m12 m11 m10 m9 m8 m7 m6-m0 operating mode 0 0 0 0 0 0 valid normal operation 0 0 0 0 1 0 id val normal operation/reset dll - - - - -- - all other states reserved figure 1 - mode burst definition
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 8 austin semiconductor, inc. t0 t1 t2 t2n t3 t3n command dqs dq t0 t1 t2 t2n t3 t3n command read nop nop nop cl = 2 clk clk read nop nop nop dq dqs clk clk cl = 2.5 burst length = 4 in the cases shown shown with nominal tac and nominal tdsdq data don't care transitioning data ba 1 ba 0 a 12 a 11 a 10 a 9 a 8 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 address bus dll ds operating mode 1 1 0 1 qfc# extended mode register (ex) dll enable disable e0 0 1 drive strength normal reduced e1 0 1 qfc# function disabled reserved e2 2 0 - operating mode reserved reserved e2, e1, e0 valid - e12 0 - e10 0 - e9 0 - e8 0 - e7 0 - e6 0 - e5 0 - e4 0 - e3 0 - 0 - e11 1. e14 and e13 must be "0, 1" to select the extended mode register (vs. the base mode register) 2. the qfe# function is not supported. figure 2 - cas latency figure 3 - extended mode register definition output drive strength the normal full drive strength for all outputs are specified to be sstl2, class ii. the ddr sdram supports an option for reduced drive. this option is intended for the support of the lighter load and/or point-to-point environments. the selection of the reduced drive strength will alter the dqs and dqss from sstl2, class ii drive strength to a reduced drive strength, which is approximately 54 percent of the sstl2, class ii drive strength. dll enable/disable the dll must be enabled for normal operation. dll enable is required during power-up initialization and upon returning to normal operation after having disabled the dll for the purpose of debug or evaluation. (when the device exits self refresh mode, the dll is enabled automatically.) any time the dll is enabled, 200 clock cycles must occur before a read command can be issued. commands the truth table provides a quick reference of available commands. this is followed by a written description of each command. deselect the deselect function (cs# high) prevents new commands from being executed by the ddr sdram. the sdram is effectively deselected. operations already in progress are not affected. no operation (nop) the no operation (nop) command is used to perform a nop to the selected ddr sdram (cs# is low). this prevents unwanted commands from being registered during idle or wait states. operations already in progress are not affected. load mode register the mode registers are loaded via inputs a0-12. the load mode register command can only be issued when all banks are idle, and a subsequent executable command cannot be issued until t mrd is met. active the active command is used to open (or activate) a row in a particular bank for a subsequent access. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-12 selects the row. this row remains active (or open) for accesses until a precharge command is issued to that bank. a precharge command must be issued before opening a different row in the same bank.
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 9 austin semiconductor, inc. name (function) cs# ras# cas# we# a ddr deselect (nop)(9) h xxxx no operation (nop) (9) l h h h x active (select bank and activate row) (3) l l h h bank/row read (select bank and column, and start read burst) (4) l h l h bank/col write (select bank and column, and start write burst) (4) l h l l bank/col burst terminate (8) l h h l x precharge (deactivate row in bank or banks) (5) l l h l code auto refresh or self refresh (enter self refresh mode) (6,7) l l l h x load mode register (2) llllop- code truth table - dm operation name (function) dm dqs write enable (10) l valid write inhibit (10) h x truth table - commands (note 1) notes: 1. cke is high for all commands shown except self refresh. 2. a0-12 define the op-code to be written to the selected mode register. ba0, ba1 select either the mode register (0, 0) or the extended mode register (1, 0). 3. a0-12 provide row address, and ba0, ba1 provide bank address. 4. a0-8 provide column address; a10 high enables the auto precharge feature (non-persistent), while a10 low disables the auto precharge feature; ba0, ba1 provide bank address. 5. a10 low: ba0, ba1 determine the bank being precharged. a10 high: all banks precharged and ba0, ba1 are ?don?t care.? 6. this command is auto refresh if cke is high; self refresh if cke is low. 7. internal refresh counter controls row addressing; all inputs and i/os are ?don?t care? except for cke. 8. applies only to read bursts with auto precharge disabled; this command is undefined (and should not be used) for read bursts with auto precharge enabled and for write bursts. 9. deselect and nop are functionally interchangeable. 10. used to mask write data; provided coincident with the corresponding data. read the read command is used to initiate a burst read access to an active row. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0- 9 selects the starting column location. the value on input a10 determines whether or not auto precharge is used. if auto precharge is selected, the row being accessed will be precharged at the end of the read burst; if auto precharge is not selected, the row will remain open for subsequent accesses. write the write command is used to initiate a burst write access to an active row. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0- 9 selects the starting column location. the value on input a10 determines whether or not auto precharge is used. if auto precharge is selected, the row being accessed will be precharged at the end of the write burst; if auto precharge is not selected, the row will remain open for subsequent accesses. input data appearing on the d/qs iswritten to the memory array subject to the dqm input logic level appearing coincident with the data. if a given dqm signal is registered low, the corresponding data will be written to memory; if the dqm signal is registered high, the corresponding data inputs will be ignored, and a write will not be executed to that byte/column location. precharge the precharge command is used to deactivate the open row in a particular bank or the open row in all banks. the bank(s) will be available for a subsequent row access a specified time (t rp ) after the precharge command is issued. except in the case of concurrent auto precharge, where a read or write command to a different bank is allowed as long as it does not interrupt the data transfer in the current bank and does not violate any other timing parameters. input a10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs ba0, ba1 select the bank. otherwise ba0, ba1 are treated as ?don?t care.? once a bank has been precharged, it is in the idle state and must be activated prior to any read or write commands being issued to that bank. a precharge command will be treated as a nop if there is no open row in that bank (idle state), or if the previously open row is already in the process of precharging.
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 10 austin semiconductor, inc. auto precharge auto precharge is a feature which performs the same individual-bank precharge function described above, but without requiring an explicit command. this is accomplished by using a10 to enable auto precharge in conjunction with a specific read or write command. a precharge of the bank/row that is addressed with the read or write command is automatically performed upon completion of the read or write burst. auto precharge is nonpersistent in that it is either enabled or disabled for each individual read or write command. the device supports concurrent auto precharge if the command to the other bank does not interrupt the data transfer to the current bank. auto precharge ensures that the precharge is initiated at the earliest valid stage within a burst. this ?earliest valid stage? is determined as if an explicit precharge command was issued at the earliest possible time, without violating t ras (min).the user must not issue another command to the same bank until the precharge time (t rp ) is completed. this is determined as if an explicit precharge command was issued at the earliest possible time, without violating t ras (min). burst terminate the burst terminate command is used to truncate read bursts (with auto precharge disabled). the most recently registered read command prior to the burst terminate command will be truncated. the open page which the read burst was terminated from remains open. auto refresh auto refresh is used during normal operation of the ddr sdram and is analogous to cas#-before-ras# (cbr) refresh in conventional drams. this command is nonpersistent, so it must be issued each time a refresh is required. the addressing is generated by the internal refresh controller. this makes the address bits ?don?t care? during an auto refresh command. each ddr sdram requires auto refresh cycles at an average interval of 7.8125 s (maximum). to allow for improved efficiency in scheduling and switching between tasks, some flexibility in the absolute refresh interval is provided. a maximum of eight auto refresh commands can be posted to any given ddr sdram, meaning that the maximum absolute interval between any auto refresh command and the next auto refresh command is 9 x 7.8125 s (70.3 s). this maximum absolute interval is to allow future support for dll updates internal to the ddr sdram to be restricted to auto refresh cycles, without allowing excessive drift in t ac between updates. although not a jedec requirement, to provide for future functionality features, cke must be active (high) during the auto refresh period. the auto refresh period begins when the auto refresh command is registered and ends t rfc later. self refresh* the self refresh command can be used to retain data in the ddr sdram, even if the rest of the system is powered down. when in the self refresh mode, the ddr sdram retains data without external clocking. the self refresh command is initiated like an auto refresh command except cke is disabled (low). the dll is automatically disabled upon entering self refresh and is automatically enabled upon exiting self refresh (200 clock cycles must then occur before a read command can be issued). input signals except cke are ?don?t care? during self refresh. the procedure for exiting self refresh requires a sequence of commands. first, clk must be stable prior to cke going back high. once cke is high, the ddr sdram must have nop commands issued for t xsnr , because time is required for the completion of any internal refresh in progress. a simple algorithm for meeting both refresh and dll requirements is to apply nops for 200 clock cycles before applying any other command. * self refresh available in commercial and industrial temperatures only.
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 11 austin semiconductor, inc. paramete r unit voltage on v cc , v ccq supply relative to v ss -1 ot 3.6 v voltage on i/o pins relative to v ss -1 ot 3.6 v operating temperature t a (mil) -55 to +125 o c operating temperature t a (ind) -40 to +85 o c storage temperature, plastic -55 to +150 o c note: stress greater than those listed under "absolute maximum ratings" may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions greater than those indicated in the operational conditions for extended periods may affect reliability. absolute maximum ratings capacitance (note 13) paramete r symbol max unit input capacitance: clk c 11 8pf addresses, ba0-1 input capacitance ca 30 pf input capacitance: all other input-only pins c 12 9pf input/output capacitance: i/o's c 10 12 pf
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 12 austin semiconductor, inc. dc electrical characteristics and operating conditions (notes 1,6) v cc , v ccq = +2.5v 0.2v; -55 o c 0.2v, -55 o c t a +125 o c ac input operating conditions (notes 1,6)14, 28, 40 v cc , v ccq = +2.5v 0.2v; -55 o c 0.2v, -55 o c t a +125 o c i cc specifications and conditions (notes 1-5, 10, 12, 14) v cc , v ccq = +2.5v 0.2v; -55 o c 0.2v, -55 o c t a +125 o c parameter / condition symbol min max units supply voltage v cc 2.3 2.7 v i/o supply voltage v ccq 2.3 2.7 v input leakage current: any input 0v ? v in ? v cc (all other pins not under test = 0v) i i -2 2 a input leakage address current (all other pins not under test = 0v) i i -10 10 a output leakage current: i/o's are disabled; 0v ? v out ? v cc i oz -5 5 a output levels: full drive option high current (v out = v ccq - 0.373v, minimum v ref , minimum v tt ) low current (v out = 0.373v, maximum v ref , maximum v tt ) i ol 12 - ma output levels: reduced drive option high current (v out = v ccq - 0.763v, minimum v ref , minimum v tt ) low current (v out = 0.763v, maximum v ref , maximum v tt ) i olr 9-ma i/o reference voltage (6) v ref 0.49 x v ccq 0.51 x v ccq v i/o termination voltage (53) v tt v ref - 0.04 v ref + 0.04 v ma -9 - ma i oh i ohr -12 - parameter / condition symbol min max units input high (logic 1) voltage: v ih (ac) v ref + 0.310 -v input low (logic ) voltage: v il (ac) - v ref - 0.310 v 333, 266 250 mbps precharge power-down standby current: all banks idle; power-down mode; t ck =t ck (min); cke=low; (23, 32. 50) i cc2p 20 20 ma active power-down standby current: one bank active; power-down mode; t ck =t ck (min); cke=low (23, 32, 50) i cc3p 150 150 ma i cc5 1225 1225 ma i cc5a 30 30 ma self refresh current: cke ? 0.2v i cc6 20 20 ma standard (11) parameter / condition t ref =t rc (min) (27, 50) t ref =7.8125 s (27, 50) auto refresh current idle standby current: cs#=high, all banks idle; t ck =t ck (min); cke=high; address and other control inputs changing once per clock cycle. v in =v ref for dq, dqs and dm (51) active standby current: cs#=high; cke=high; one bank; active precharge; t rc =t ras (max); t ck =t ck (min); dq, dm and dqs inputs changin twicer per clock cycle; address and other control inputs changing once per clock cycle (22) operating current: burst=2; reads; continuous burst; one bank active; address and control inputs changing once per clock cycle; t ck =t ck (min); i out =0ma (22,48) operating current: burst=2; writes; continuous burst; one bank active; address and control inputs changing once per clock cycle ; t ck =t ck (min); dq, dm and dqs inputs changin twice per clock cycle (22) operating current: four bank interleaving deads (bl=4) with auto precharge, t rc =t rc (min); t ck =t ck (min); addresses and control inputs change only during active read or write commands. (22, 49) i cc0 i cc1 i cc2f i cc3n i cc4r i cc4w i cc7 operating current: one bank, active-precharge; t rc = t rc (min); t ck = t ck (min); dq, dm, and dqs inputs changing once per clock cycle; address and control inputs changing once every two clock cycles; (22, 48) operating current: one bank, active-read- precharge; burst=2; t rc = t rc (min); t ck = t ck (min); i out = 0ma; address and control inputs changing once every two clock cycles; (22, 48) units 200 mbps max symbol 625 600 ma 850 775 ma 225 225 ma 250 250 ma 2000 2000 ma 925 925 ma 800 800 ma
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 13 austin semiconductor, inc. electrical characteristics and recommended ac operating characteristics (notes 1-5, 14-17, 33) min max min max t ac -0.70 +0.70 -0.75 +0.75 ns t ch 0.45 0.55 0.45 0.55 t ck t cl 0.45 0.55 0.45 0.55 t ck cl=2.5 (45, 52) t ck (2.5) 6 13 7.5 13 ns cl=2 (45, 52) t ck (2) 7.5 13 8 13 ns t dh 0.45 0.5 ns t ds 0.45 0.5 ns t dipw 1.75 1.75 ns t dqsck -0.6 +0.6 -0.75 +0.75 ns tdqsh 0.35 0.35 t ck t dqsl 0.35 0.35 t ck t dqsq 0.45 0.5 ns t dqss 0.75 1.25 0.75 1.25 t ck t dss 0.2 0.2 t ck t dsh 0.2 0.2 t ck t hp t ch , t cl t ch , t cl ns t hz +0.7 +0.75 ns t lz -0.7 -0.75 ns t ihf 0.75 0.9 ns t isf 0.75 0.9 ns t ihs 0.8 1.0 ns t iss 0.8 1.0 ns t mrd 12 15 ns t qh ns t qhs 0.55 1 ns t ras 42 70,000 40 120,000 ns t rap 15 15 ns t rc 60 60 ns t rfc 72 75 ns t rcd 15 15 ns t rp 15 15 ns t rpre 0.9 1.1 0.9 1.1 t ck t rpst 0.4 0.6 0.4 0.6 t ck t rrd 12 15 ns t wpre 0.25 0.25 t ck t wpres 00ns t wpst 0.4 0.6 0.4 0.6 t ck t wr 15 15 ns t wtr 11 t ck na ns t refc 70.3 70.3 s t refc 35 35 s t refi 7.8 7.8 s t refi 3.9 3.9 s t vtd 00ns t xsnr 75 75 ns t xsrd 200 200 t ck t qh - t dqsq t hp -t qhs t hp -t qhs t qh - t dqsq symbol @cl=2.5 [cl=2] -6, 333 [266] mbps units -75, 266 [250] mbps @cl=2.5 [cl=2] exit self refresh to non-read command exit self refresh to read command clock cycle time parameter refresh to refresh command interval (military temp only) (23) average periodic refresh interval (commercial & industrial temp only) (23) average periodic refresh interval (military temp only) (23) terminating voltage delay to vcc (53) write recovery time internal write to read command delay refresh to refresh command interval (commercial & industrial temp active bank a to active bank b command dqs write preamble dqs write preamble setup time (20,21) dqs write postamble (19) precharge command period dqs read preamble (42) dqs read postamble data valid output window (25) active to read with auto precharge command active to active/auto refresh command period auto refresh command period (50) active to read or write delay load mode register command cycle time dq-dqs hold, dqs to first dq to go non-valid, per access (25, 26) data hold skew factor active to precharge command (35) address and control input hold time (fast slew rate) (14) address and control input setup time (fast slew rate) (14) address and control input hold time (slow slew rate) (14) address and control input setup time (slow slew rate) (14) dqs falling edge to clk rising - hold time half clock period (34) data-out high-impedance window from clk/clk# (18, 42) data-out low-impedance window from clk/clk# (18, 43) dqs input high pulse width dqs-dq skew, dqs to last valid, per group, per access (25,26) write command to first dqs latching transition dqs falling edge to clk rising - setup time dq and dm input setup time relative to dqs (26,31) dq and dm input pulse with (for each input) (31) access window of dqs from clk/clk# dqs input high pulse width access window of dqs from clk/clk# clk high-level width (30) clk low-level width (30) dq and dm input hold time relative to dqs (26, 31)
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 14 austin semiconductor, inc. electrical characteristics and recommended ac operating characteristics (notes 1-5, 14-17, 33) min max min max t ac -0.8 +0.8 -0.8 +0.8 ns t ch 0.45 0.55 0.45 0.55 t ck t cl 0.45 0.55 0.45 0.55 t ck cl=2.5 (45, 52) t ck (2.5) 8 131013ns cl=2 (45, 52) t ck (2) 10 13 13 15 ns t dh 0.6 0.6 ns t ds 0.6 0.6 ns t dipw 22ns t dqsck -0.8 +0.8 -0.8 +0.8 ns tdqsh 0.35 0.35 t ck t dqsl 0.35 0.35 t ck t dqsq 0.6 0.6 ns t dqss 0.75 1.25 0.75 1.25 t ck t dss 0.2 0.2 t ck t dsh 0.2 0.2 t ck t hp t ch , t cl t ch , t cl ns t hz +0.8 +0.8 ns t lz -0.8 -0.8 ns t ihf 1.1 1.1 ns t isf 1.1 1.1 ns t ihs 1.1 1.1 ns t iss 1.1 1.1 ns t mrd 16 16 ns t qh ns t qhs 11ns t ras 40 120,000 40 120,000 ns t rap 20 20 ns t rc 70 70 ns t rfc 80 80 ns t rcd 20 20 ns t rp 20 20 ns t rpre 0.9 1.1 0.9 1.1 t ck t rpst 0.4 0.6 0.4 0.6 t ck t rrd 15 15 ns t wpre 0.25 0.25 t ck t wpres 00ns t wpst 0.4 0.6 0.4 0.6 t ck t wr 15 15 ns t wtr 11 t ck na ns t refc 70.3 70.3 s t refc 35 35 s t refi 7.8 7.8 s t refi 3.9 3.9 s t vtd 00ns t xsnr 80 80 ns t xsrd 200 200 t ck t qh -t dqsq t hp -t qhs t hp -t qhs t qh -t dqsq symbol @cl=2.5 [cl=2] -8, 250 [200] mbps units -10, 200 [167] mbps @cl=2.5 [cl=2] exit self refresh to non-read command exit self refresh to read command clock cycle time parameter refresh to refresh command interval (military temp only) (23) average periodic refresh interval (commercial & industrial temp only) (23) average periodic refresh interval (military temp only) (23) terminating voltage delay to vcc (53) write recovery time internal write to read command delay refresh to refresh command interval (commercial & industrial temp active bank a to active bank b command dqs write preamble dqs write preamble setup time (20,21) dqs write postamble (19) precharge command period dqs read preamble (42) dqs read postamble data valid output window (25) active to read with auto precharge command active to active/auto refresh command period auto refresh command period (50) active to read or write delay load mode register command cycle time dq-dqs hold, dqs to first dq to go non-valid, per access (25, 26) data hold skew factor active to precharge command (35) address and control input hold time (fast slew rate) (14) address and control input setup time (fast slew rate) (14) address and control input hold time (slow slew rate) (14) address and control input setup time (slow slew rate) (14) dqs falling edge to clk rising - hold time half clock period (34) data-out high-impedance window from clk/clk# (18, 42) data-out low-impedance window from clk/clk# (18, 43) dqs input high pulse width dqs-dq skew, dqs to last valid, per group, per access (25,26) write command to first dqs latching transition dqs falling edge to clk rising - setup time dq and dm input setup time relative to dqs (26,31) dq and dm input pulse with (for each input) (31) access window of dqs from clk/clk# dqs input high pulse width access window of dqs from clk/clk# clk high-level width (30) clk low-level width (30) dq and dm input hold time relative to dqs (26, 31)
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 15 austin semiconductor, inc. notes: 1. all voltages referenced to v ss . 2. tests for ac timing, i cc , and electrical ac and dc characteristics may be conducted at nominal reference/supply voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified. 3. outputs measured with equivalent load: 4. ac timing and i cc tests may use a v il -to-v ih swing of up to 1.5v in the test environment, but input timing is still referenced to v ref (or to the crossing point for clk/clk#), and parameter specifications are guaranteed for the specified ac input levels under normal use conditions. the minimum slew rate for the input signals used to test the device is 1v/ns in the range between v il (ac) and v ih (ac). 5. the ac and dc input level specifications are as defined in the sstl_2 standard (i.e., the receiver will effectively switch as a result of the signal crossing the ac input level, and will remain in that state as long as the signal does not ring back above [below] the dc input low [high] level). 6. v ref is expected to equal v ccq /2 of the transmitting device and to track variations in the dc level of the same. peak-to-peak noise (noncommon mode) on v ref may not exceed 2 percent of the dc value. thus, from v ccq /2, v ref is allowed 25mv for dc error and an additional 25mv for ac noise. this measurement is to be taken at the nearest v ref by-pass capacitor. 7. v tt is not applied directly to the device. v tt is a system supply for signal termination resistors, is expected to be set equal to v ref and must track variations in the dc level of v ref . 8. v id is the magnitude of the difference between the input level on clk and the input level on clk#. 9. the value of v ix and v mp are expected to equal v ccq /2 of the transmitting device and must track variations in the dc level of the same. 10. i cc is dependent on output loading and cycle rates. specified values are obtained with minimum cycle time with the outputs open. 11. enables on-chip refresh and address counters. 12. i cc specifications are tested after the device is properly initialized, and is averaged at the defined cycle rate. 13. this parameter is not tested but guaranteed by design. t a = 25 o c, f = 1 mhz 14. command/address input slew rate = 0.5v/ns. for 266 mhz with slew rates 1v/ns and faster, t is and t ih are reduced to 900ps. if the slew rate is less than 0.5v/ns, timing must be derated: t is has an additional 50ps per each 100mv/ns reduction in slew rate from the 500mv/ns. t ih has 0ps added, that is, it remains constant. if the level, slew rate exceeds 4.5v/ns, functionality is uncertain. v tt 50 ? reference output point 30pf (v out ) 15. the clk/clk# input reference level (for timing referenced to clk/clk#) is the point at which clk and clk# cross; the input reference level for signals other than clk/clk# is v ref . 16. inputs are not recognized as valid until v ref stabilizes. exception: during the period before v ref stablizes, cke < 0.3 x vccq is recognized as low. 17. the output timing reference level, as measured at the timing reference point indicated in note 3, is v tt . 18. t hz and t lz transitions occur in the same access time windows as valid data transitions. these parameters are not referenced to a specific voltage level, but specify when the device output is no longer driving (hz) or begins driving (lz). 19. the maximum limit for this parameter is not a device limit. the device will operate with a greater value for this parameter, but system performance (bus turnaround) will degrade accordingly. 20. this is not a device limit. the device will operate with a negative value, but system performance could be degraded due to bus turnaround. 21. it is recommended that dqs be valid (high or low) on or before the write command. the case shown (dqs going from high-z to logic low) applies when no writes were previously in progress on the bus. if a previous write was in progress, dqs could be high during this time, depending on t dqss . 22. min (t rc or t rfc ) for i cc measurements is the smallest multiple of t ck that meets the minimum absolute value for the respective parameter. t ras (max) for i cc measurements is the largest multiple of t ck that meets the maximum absolute value for t ras . 23. the refresh period 64ms. this equates to an average refresh rate of however, an auto refresh command must be asserted at least once every 70.3s; burst refreshing or posting by the dram controller greater than eight refresh cycles is not allowed. 24. the i/o capacitance per dqs and dq byte/group will not differ by more than this maximum amount for any given device. 25. the valid data window is derived by achieving other specifications - t hp (t ck /2), t dqsq , and t qh (t qh = t hp - t qhs ). the data valid window derates directly porportional with the clock duty cycle and a practical data valid window can be derived. the clock is allowed a maximum duty cycle variation of 45/55. functionality is uncertain when operating beyond a 45/55 ratio. the data valid window derating curves are provided 26. referenced to each output group: ldqs with dq0-dq7; and udqs with dq8-dq15 of each chip. 27. this limit is actually a nominal value and does not result in a fail value. cke is high below for duty cycles ranging between 50/50 and 45/55. during refresh command period (t rfc [min]) else cke is low (i.e., during standby) 28. to maintain a valid level, the transitioning edge of the input must: a) sustain a constant slew rate from the current ac level through to the target ac level, v il (ac) or v ih (ac). b) reach at least the target ac level. c) after the ac target level is reached, continue to maintain at least the target dc level, v il (dc) or v ih (dc). 160 0 maximum nominal high nominal low minimum nominal high nominal low minimum maximum -20 140 -40 120 -60 -80 i out (ma) i out (ma) -100 -120 -140 40 -160 20 -180 0 -200 0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.5 1.0 1.5 2.0 2.5 v out (v) v ccq - v out (v) 100 80 60 figure a - pull-down characteristics figure b - pull-up characteristics
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 16 austin semiconductor, inc. 29. the input capacitance per pin group will not differ by more than this maximum amount for any given device. 30. clk and clk# input slew rate must be > 1v/ns (>2v/ns differentially). 31. dq and dm input slew rates must not deviate from dqs by more than 10%. if the dq/dm/dqs slew rate is less than 0.5v/ns, timing must be derated: 50ps must be added to t ds and t dh for each 100mv/ns reduction in slew rate. if slew rate exceeds 4v/ns, functionality is uncertain. 32. v cc must not vary more than 4% if cke is not active while any bank is active. 33. the clock is allowed up to 150ps of jitter. each timing parameter is allowed to vary by the same amount. 34. t hp min is the lesser of t cl minimum and t ch minimum actually applied to the device clk and clk# inputs, collectively during bank active. 35. reads and writes with auto precharge are not allowed to be issued until t ras (min) can be satisfied prior to the internal precharge command being issued. 36. any positive glitch must be less than 1/3 of the clock and not more than +400mv or 2.9 volts, whichever is less. any negative glitch must be less than 1/3 of the clock cycle and not exceed either -300mv or 2.2 volts, whichever is more positive. 37. normal output drive curves: a) the full variation in driver pull-down current from minimum to maximum process, temperature and voltage will lie within the outer bounding lines of the v-i curve of figure a. b) the variation in driver pull-down current within nominal limits of voltage and temperature is expected, but not guaranteed, to lie within the inner bounding lines of the v-i curve of figure a. c) the full variation in driver pull-up current from minimum to maximum process, temperature and voltage will lie within the outer bounding lines of the v-i curve of figure b. d) the variation in driver pull-up current within nominal limits of voltage and temperature is expected, but not guaranteed, to lie within the inner bounding lines of the v-i curve of figure b. e) the full variation in the ratio of the maximum to minimum pull-up and pull-down current should be between .71 and 1.4, for device drain- to-source voltages from 0.1v to 1.0 volt, and at the same voltage and temperature. f) the full variation in the ratio of the nominal pull-up to pull-down current should be unity ?10%, for device drain-to-source voltages from 0.1v to 1.0 volt. 38. reduced output drive curves: a) the full variation in driver pull-down current from minimum to maximum process, temperature and voltage will lie within the outer bounding lines of the v-i curve of figure c. b) the variation in driver pull-down current within nominal limits of voltage and temperature is expected, but not guaranteed, to lie within the inner bounding lines of the v-i curve of figure c. c) the full variation in driver pull-up current from minimum to maximum process, temperature and voltage will lie within the outer bounding lines of the v-i curve of figure d. d) the variation in driver pull-up current within nominal limits of voltage and temperature is expected, but not guaranteed, to lie within the inner bounding lines of the v-i curve of figure b. e) the full variation in the ratio of the maximum to minimum pull-up and pull-down current should be between .71 and 1.4, for device drain- to-source voltages from 0.1v to 1.0 volt, and at the same voltage and temperature. f) the full variation in the ratio of the nominal pull-up to pull-down current should be unity 10%, for device drain-to-source voltages from 0.1v to 1.0 volt. 39. the voltage levels used are derived from a minimum v cc level and the referenced test load. in practice, the voltage levels obtained from a properly terminated bus will provide significantly different voltage values. 40. v ih overshoot: v ih (max) = v ccq +1.5v for a pulse width < 3ns and the pulse width can not be greater than 1/3 of the cycle rate. 41. v cc and v ccq must track each other. 42. this maximum value is derived from the referenced test load. in practice, the values obtained in a typical terminated design may reflect up to 310ps less for t hz (max) and the last dvw. t hz (max) will prevail over t dqsck (max) + t rpst (max) condition. t lz (min) will prevail over t dqsck (min) + t rpre (max) condition. 43. for slew rates greater than 1v/ns the (lz) transition will start about 310ps earlier. 44. during initialization, v ccq , v tt , and v ref must be equal to or less than v cc + 0.3v. alternatively, v tt may be 1.35v maximum during power up, even if v cc /v ccq are 0 volts, provided a minimum of 42 ohms of series resistance is used between the v tt supply and the input pin. 45. the current part operates below the slowest jedec operating frequency of 83 mhz. as such, future die may not reflect this option. 46. reserved for future use. 47. reserved for future use. 48. random addressing changing 50% of data changing at every transfer. 49. random addressing changing 100% of data changing at every transfer. 50. cke must be active (high) during the entire time a refresh command is executed. that is, from the time the auto refresh command is registered, cke must be active at each rising clock edge, until t rfc has been satisfied. 51. i cc2n specifies the dq, dqs, and dm to be driven to a valid high or low logic level. i cc2q is similar to i cc2f except i cc2q specifies the address and control inputs to remain stable. although i cc2f , i cc2n , and i cc2q are similar, i cc2f is ?worst case.? 52. whenever the operating frequency is altered, not including jitter, the dll is required to be reset. this is followed by 200 clock cycles before any read command. 53. v tt is not applied directly to the device; however, t vtd should be greater than or equal to zero to avoid device latch-up. v ccq , v tt and v ref must be equal to or less than v cc + 0.3v. alternatively v tt may be 1.35v max during power-up even if v cc /v ccq are 0v, provided a minimum of 42 &! of series resistance is used between the v tt supply and the input pin. once initialized, v ref must always be powered within the specified range. 80 0 nominal low minimum maximum nominal high maximum nominal high nominal low minimum -10 70 -20 60 -30 50 i out (ma) -40 i out (ma) 40 -50 30 -60 20 -70 10 -80 0 0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.5 1.0 1.5 2.0 2.5 v out (v) v ccq - v out (v) figure c - pull-down characteristics figure d - pull-up characteristics
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 17 austin semiconductor, inc. 32.1 (1.264) max 1 2 3 4 5 6 7 8 9 t r p n m l k j h g f e d c b a 25.1 (0.988) max 0.61 (0.024) nom 2.03 (0.080) max 19.05 (0.750) nom 1.27 (0.050) nom 19.05 (0.750) nom 219 x ? 0.762 (0.030) nom bottom view 10 11 12 13 14 15 16 all linear dimensions are millimeters and parenthetically in inches package dimension: 219 plastic ball grid array (pbga)
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 18 austin semiconductor, inc. ordering information part numbe r core freq. data transfer rate package process as4ddr32m72-6/it 166 mhz 333 mbps 219-pbga industrial as4ddr32m72-75/it 133 mhz 266 mbps 219-pbga industrial as4ddr32m72-8/it 125 mhz 250 mbps 219-pbga industrial as4ddr32m72-10/it 100 mhz 200 mbps 219-pbga industrial as4ddr32m72-75/et 133 mhz 266 mbps 219-pbga enhanced as4ddr32m72-8/et 125 mhz 250 mbps 219-pbga enhanced as4ddr32m72-10/et 100 mhz 200 mbps 219-pbga enhanced as4ddr32m72-75/xt 133 mhz 266 mbps 219-pbga extended as4ddr32m72-8/xt 125 mhz 250 mbps 219-pbga extended as4ddr32m72-10/xt 100 mhz 200 mbps 219-pbga extended
i i i i i pem pem pem pem pem 2.4g 2.4g 2.4g 2.4g 2.4g b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr b sdram-ddr as4ddr32m72pbg as4ddr32m72pbg rev. 1.0 09/06 austin semiconductor, inc. reserves the right to change products or specifications without notice. 19 austin semiconductor, inc. document title 32m x 72 ddr sdram multi-chip packaged in a 32mm x 25mm - 219 pbga revision history rev # history release date status 1.0 release march 2005 preliminary

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