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? 2007 microchip technology inc. ds21828d-page 1 25aa320a/25lc320a device selection table features: ? max. clock 10 mhz ? low-power cmos technology - max. write current: 5 ma at 5.5v, 10 mhz - read current: 5 ma at 5.5v, 10 mhz - standby current: 5 a at 5.5v ? 4096 x 8-bit organization ? 32 byte page ? self-timed erase and write cycles (5 ms max.) ? block write protection - protect none, 1/4, 1/2 or all of array ? built-in write protection - power-on/off data protection circuitry - write enable latch - write-protect pin ? sequential read ? high reliability - endurance: >1m erase/write cycles - data retention: > 200 years - esd protection: > 4000v ? temperature ranges supported; ? standard and pb-free packages available pin function table description: the microchip technology inc. 25aa320a/25lc320a (25xx320a * ) are 32k-bit serial electrically erasable proms. the memory is accessed via a simple serial peripheral interface (spi) compatible serial bus. the bus signals required are a clock input (sck) plus sep- arate data in (si) and data out (so) lines. access to the device is controlled through a chip select (cs ) input. communication to the device can be paused via the hold pin (hold ). while the device is paused, transi- tions on its inputs will be ignored, with the exception of chip select, allowing the host to service higher priority interrupts. the 25xx320a is available in standard packages including 8-lead pdip and soic, and advanced packaging including 8-lead msop, and 8-lead tssop. all packages are pb-free. package types (not to scale) part number v cc range page size temp. ranges packages 25lc320a 2.5-5.5v 32 byte i,e p, sn, st, ms 25aa320a 1.8-5.5v 32 byte i p, sn, st, ms - industrial (i): -40 cto +85 c - automotive (e): -40c to +125c name function cs chip select input so serial data output wp write-protect v ss ground si serial data input sck serial clock input hold hold input v cc supply voltage cs so wp v ss 1 2 3 4 8 7 6 5 v cc hold sck si pdip/soic (p, sn) tssop/msop cs so wp v ss 1 2 3 4 8 7 6 5 v cc hold sck si (st, ms) 32k spi bus serial eeprom *25xx320a is used in this document as a generic part number for the 25aa320a, 25lc320a devices.
25aa320a/25lc320a ds21828d-page 2 ? 2007 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings (?) v cc ............................................................................................................................... ..............................................6.5v all inputs and outputs w.r.t. v ss ......................................................................................................... -0.6v to v cc +1.0v storage temperature ............................................................................................................ .....................-65c to 150c ambient temperature under bias ................................................................................................. ..............-65c to 125c esd protection on all pins ..................................................................................................... .....................................4 kv table 1-1: dc characteristics ? notice : stresses above 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 those or any other conditions above those indicated in the operational listings of this specification is not implied. exposure to maximum rating conditions for an extended period of time may affect device reliability. dc characteristics industrial (i): t a = -40c to +85c v cc = 1.8v to 5.5v automotive (e): t a = -40c to +125c v cc = 2.5v to 5.5v param. no. sym. characteristic min. max. units test conditions d001 v ih 1 high-level input voltage .7 v cc v cc +1 v d002 v il 1 low-level input voltage -0.3 0.3v cc vv cc 2.7v d003 v il 2 -0.3 0.2v cc vv cc < 2.7v d004 v ol low-level output voltage ?0.4vi ol = 2.1 ma d005 v ol ?0.2vi ol = 1.0 ma, v cc < 2.5v d006 v oh high-level output voltage v cc -0.5 ? v i oh = -400 a d007 i li input leakage current ? 1 acs = v cc , v in = v ss to v cc d008 i lo output leakage current ?1 acs = v cc , v out = v ss to v cc d009 c int internal capacitance (all inputs and outputs) ?7pft a = 25c, clk = 1.0 mhz, v cc = 5.0v (note) d010 i cc read operating current ? ? 5 2.5 ma ma v cc = 5.5v; f clk = 10.0 mhz; so = open v cc = 2.5v; f clk = 5.0 mhz; so = open d011 i cc write ? ? 5 3 ma ma v cc = 5.5v v cc = 2.5v d012 i ccs standby current ? ? 5 1 a a cs = v cc = 5.5v, inputs tied to v cc or v ss , 125c cs = v cc = 5.5v, inputs tied to v cc or v ss , 85c note: this parameter is periodically sampled and not 100% tested.
? 2007 microchip technology inc. ds21828d-page 3 25aa320a/25lc320a table 1-2: ac characteristics ac characteristics industrial (i): t a = -40c to +85c v cc = 1.8v to 5.5v automotive (e): t a = -40c to +125c v cc = 2.5v to 5.5v param. no. sym. characteristic min. max. units test conditions 1f clk clock frequency ? ? ? 10 5 3 mhz mhz mhz 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 2t css cs setup time 50 100 150 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 3t csh cs hold time 100 200 250 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 4t csd cs disable time 50 ? ns ? 5 tsu data setup time 10 20 30 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 6t hd data hold time 20 40 50 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 7t r clk rise time ? 2 s (note 1) 8t f clk fall time ? 2 s (note 1) 9t hi clock high time 50 100 150 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 10 t lo clock low time 50 100 150 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 11 t cld clock delay time 50 ? ns ? 12 t cle clock enable time 50 ? ns ? 13 t v output valid from clock low ? ? ? 50 100 160 ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 14 t ho output hold time 0 ? ns (note 1) 15 t dis output disable time ? ? ? 40 80 160 ns ns ns 4.5v vcc 5.5v (note 1) 2.5v vcc 4.5v (note 1) 1.8v vcc 2.5v (note 1) 16 t hs hold setup time 20 40 80 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v note 1: this parameter is periodically sampled and not 100% tested. 2: t wc begins on the rising edge of cs after a valid write sequence and ends when the internal write cycle is complete. 3: this parameter is not tested but ensured by characterization. for endurance estimates in a specific application, please consult the total endurance? model which can be obtained from our web site: www.microchip.com.
25aa320a/25lc320a ds21828d-page 4 ? 2007 microchip technology inc. table 1-3: ac test conditions 17 t hh hold hold time 20 40 80 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 18 t hz hold low to output high-z 30 60 160 ? ? ? ns ns ns 4.5v vcc 5.5v (note 1) 2.5v vcc < 4.5v (note 1) 1.8v vcc < 2.5v (note 1) 19 t hv hold high to output valid 30 60 160 ? ? ? ns ns ns 4.5v vcc 5.5v 2.5v vcc < 4.5v 1.8v vcc < 2.5v 20 t wc internal write cycle time ? 5 ms (n ote 2) 21 ? endurance 1m ? e/w cycles (n ote 3) table 1-2: ac characteristics (continued) ac characteristics industrial (i): t a = -40c to +85c v cc = 1.8v to 5.5v automotive (e): t a = -40c to +125c v cc = 2.5v to 5.5v param. no. sym. characteristic min. max. units test conditions note 1: this parameter is periodically sampled and not 100% tested. 2: t wc begins on the rising edge of cs after a valid write sequence and ends when the internal write cycle is complete. 3: this parameter is not tested but ensured by characterization. for endurance estimates in a specific application, please consult the total endurance? model which can be obtained from our web site: www.microchip.com. ac waveform: v lo = 0.2v ? v hi = v cc - 0.2v (note 1) v hi = 4.0v (note 2) c l = 50 pf ? timing measurement reference level input 0.5 v cc output 0.5 v cc note 1: for v cc 4.0v 2: for v cc > 4.0v
? 2007 microchip technology inc. ds21828d-page 5 25aa320a/25lc320a figure 1-1: hold timing figure 1-2: serial input timing figure 1-3: serial output timing cs sck so si hold 17 16 16 17 19 18 don?t care 5 high-impedance n + 2 n + 1 n n - 1 n n + 2 n + 1 n n n - 1 cs sck si so 6 5 8 7 11 3 lsb in msb in high-impedance 12 mode 1 , 1 mode 0 , 0 2 4 cs sck so 10 9 13 msb out isb out 3 15 don?t care si mode 1 , 1 mode 0 , 0 14
25aa320a/25lc320a ds21828d-page 6 ? 2007 microchip technology inc. 2.0 functional description 2.1 principles of operation the 25xx320a is a 4096 byte serial eeprom designed to interface directly with the serial peripheral interface (spi) port of many of today?s popular microcontroller families, including microchip?s pic16c6x/7x microcontrollers. it may also interface with microcontrollers that do not have a built-in spi port by using discrete i/o lines programmed properly in firmware to match the spi protocol. the 25xx320a contains an 8-bit instruction register. the device is accessed via the si pin, with data being clocked in on the rising edge of sck. the cs pin must be low and the hold pin must be high for the entire operation. table 2-1 contains a list of the possible instruction bytes and format for device operation. all instructions, addresses, and data are transferred msb first, lsb last. data (si) is sampled on the first rising edge of sck after cs goes low. if the clock line is shared with other peripheral devices on the spi bus, the user can assert the hold input and place the 25xx320a in ?hold? mode. after releasing the hold pin, operation will resume from the point when the hold was asserted. 2.2 read sequence the device is selected by pulling cs low. the 8-bit read instruction is transmitted to the 25xx320a fol- lowed by the 16-bit address, with the four msbs of the address being ?don?t care? bits. after the correct read instruction and address are sent, the data stored in the memory at the selected address is shifted out on the so pin. the data stored in the memory at the next address can be read sequentially by continuing to pro- vide clock pulses. the internal address pointer is auto- matically incremented to the next higher address after each byte of data is shifted out. when the highest address is reached (0fffh), the address counter rolls over to address 0000h allowing the read cycle to be continued indefinitely. the read operation is terminated by raising the cs pin (figure 2-1). 2.3 write sequence prior to any attempt to write data to the 25xx320a, the write enable latch must be set by issuing the wren instruction (figure 2-4). this is done by setting cs low and then clocking out the proper instruction into the 25xx320a. after all eight bits of the instruction are transmitted, the cs must be brought high to set the write enable latch. if the write operation is initiated immediately after the wren instruction without cs being brought high, the data will not be written to the array because the write enable latch will not have been properly set. once the write enable latch is set, the user may proceed by setting the cs low, issuing a write instruc- tion, followed by the 16-bit address, with the four msbs of the address being don?t care bits, and then the data to be written. up to 32 bytes of data can be sent to the device before a write cycle is necessary. the only restriction is that all of the bytes must reside in the same page. for the data to be actually written to the array, the cs must be brought high after the least significant bit (d0) of the n th data byte has been clocked in. if cs is brought high at any other time, the write operation will not be completed. refer to figure 2-2 and figure 2-3 for more detailed illustrations on the byte write sequence and the page write sequence respectively. while the write is in progress, the status register may be read to check the status of the wpen, wip, wel, bp1 and bp0 bits (figure 2-6). a read attempt of a memory array location will not be possible during a write cycle. when the write cycle is completed, the write enable latch is reset. note: page write operations are limited to writing bytes within a single physical page, regardless of the number of bytes actually being written. physical page boundaries start at addresses that are integer multiples of the page buffer size (or ?page size?) and, end at addresses that are integer multiples of page size ? 1. if a page write command attempts to write across a physical page boundary, the result is that the data wraps around to the beginning of the current page (overwriting data previously stored there), instead of being written to the next page as might be expected. it is therefore necessary for the application software to prevent page write operations that would attempt to cross a page boundary.
? 2007 microchip technology inc. ds21828d-page 7 25aa320a/25lc320a block diagram figure 2-1: read sequence si so sck cs hold wp status register i/o control memory control logic x dec hv generator eeprom array page latches y decoder sense amp. r/w control logic v cc v ss table 2-1: instruction set instruction name instruction format description read 0000 0011 read data from memory array beginning at selected address write 0000 0010 write data to memory array beginning at selected address wrdi 0000 0100 reset the write enable latch (disable write operations) wren 0000 0110 set the write enable latch (enable write operations) rdsr 0000 0101 read status register wrsr 0000 0001 write status register so si sck cs 0 234567891011 21222324252627282930 31 1 01 0 0 0 0 01 15 14 13 12 210 76543210 instruction 16-bit address data out high-impedance
25aa320a/25lc320a ds21828d-page 8 ? 2007 microchip technology inc. figure 2-2: byte write sequence figure 2-3: page write sequence so si cs 9 1011 21222324252627282930 31 00 0 0 0 0 01 15 14 13 12 210 76543210 instruction 16-bit address data byte high-impedance sck 0 234567 18 twc si cs 9 1011 21222324252627282930 31 00 0 0 0 0 01 15 14 13 12 210 76543210 instruction 16-bit address data byte 1 sck 0 234567 1 8 si cs 41 42 43 46 47 76543210 data byte n (32 max) sck 32 34 35 36 37 38 39 33 40 76543210 data byte 3 76543210 data byte 2 44 45
? 2007 microchip technology inc. ds21828d-page 9 25aa320a/25lc320a 2.4 write enable ( wren ) and write disable ( wrdi ) the 25xx320a contains a write enable latch. see table 2-4 for the write-protect functionality matrix. this latch must be set before any write operation will be completed internally. the wren instruction will set the latch, and the wrdi will reset the latch. the following is a list of conditions under which the write enable latch will be reset: ? power-up ? wrdi instruction successfully executed ? wrsr instruction successfully executed ? write instruction successfully executed figure 2-4: write enable sequence ( wren ) figure 2-5: write disable sequence ( wrdi ) sck 0 234567 1 si high-impedance so cs 01 0000 0 1 sck 0 234567 1 si high-impedance so cs 01 0000 0 1 0
25aa320a/25lc320a ds21828d-page 10 ? 2007 microchip technology inc. 2.5 read status register instruction ( rdsr ) the read status register instruction ( rdsr ) provides access to the status register. the status register may be read at any time, even during a write cycle. the status register is formatted as follows: table 2-2: status register the write-in-process (wip) bit indicates whether the 25xx320a is busy with a write operation. when set to a ? 1 ?, a write is in progress, when set to a ? 0 ?, no write is in progress. this bit is read-only. the write enable latch (wel) bit indicates the status of the write enable latch and is read-only. when set to a ? 1 ?, the latch allows writes to the array, when set to a ? 0 ?, the latch prohibits writes to the array. the state of this bit can always be updated via the wren or wrdi commands regardless of the state of write protection on the status register. these commands are shown in figure 2-4 and figure 2-5. the block protection (bp0 and bp1) bits indicate which blocks are currently write-protected. these bits are set by the user issuing the wrsr instruction. these bits are nonvolatile, and are shown in table 2-3. see figure 2-6 for the rdsr timing sequence. figure 2-6: read status register timing sequence ( rdsr ) 7 654 3 2 1 0 w/r ???w/rw/r r r wpen x x x bp1 bp0 wel wip w/r = writable/readable. r = read-only. so si cs 91011 12131415 11 0 0 0 0 00 7654 2 10 instruction data from status register high-impedance sck 0 234567 1 8 3
? 2007 microchip technology inc. ds21828d-page 11 25aa320a/25lc320a 2.6 write status register instruction ( wrsr ) the write status register instruction ( wrsr ) allows the user to write to the nonvolatile bits in the status register as shown in table 2-2. the user is able to select one of four levels of protection for the array by writing to the appropriate bits in the status register. the array is divided up into four segments. the user has the ability to write-protect none, one, two or all four of the segments of the array. the partitioning is controlled as shown in table 2-3. the write-protect enable (wpen) bit is a nonvolatile bit that is available as an enable bit for the wp pin. the write-protect (wp ) pin and the write-protect enable (wpen) bit in the status register control the programmable hardware write-protect feature. hard- ware write protection is enabled when wp pin is low and the wpen bit is high. hardware write protection is disabled when either the wp pin is high or the wpen bit is low. when the chip is hardware write-protected, only writes to nonvolatile bits in the status register are disabled. see table 2-4 for a matrix of functionality on the wpen bit. see figure 2-7 for the wrsr timing sequence. table 2-3: array protection figure 2-7: write status register timing sequence ( wrsr ) bp1 bp0 array addresses write-protected 00 none 01 upper 1/4 (0c00h - 0fffh) 10 upper 1/2 (0800h - 0fffh) 11 all (0000h - 0fffh) so si cs 91011 12131415 0 1 0 0 0 0 00 7654 210 instruction data to status register high-impedance sck 0 234567 1 8 3 note: an internal write cycle (t wc ) is initiated on the rising edge of cs after a valid write status register sequence.
25aa320a/25lc320a ds21828d-page 12 ? 2007 microchip technology inc. 2.7 data protection the following protection has been implemented to prevent inadvertent writes to the array: ? the write enable latch is reset on power-up ? a write enable instruction must be issued to set the write enable latch ? after a byte write, page write or status register write, the write enable latch is reset ?cs must be set high after the proper number of clock cycles to start an internal write cycle ? access to the array during an internal write cycle is ignored and programming is continued 2.8 power-on state the 25xx320a powers on in the following state: ? the device is in low-power standby mode (cs = 1 ) ? the write enable latch is reset ? so is in high-impedance state ? a high-to-low-level transition on cs is required to enter active state table 2-4: write-protect functionality matrix wel (sr bit 1) wpen (sr bit 7) wp (pin 3) protected blocks unprotected blocks status register 0xx protected protected protected 10x protected writable writable 110 (low) protected writable protected 111 (high) protected writable writable x = don?t care
? 2007 microchip technology inc. ds21828d-page 13 25aa320a/25lc320a 3.0 pin descriptions the descriptions of the pins are listed in table 3-1. table 3-1: pin function table 3.1 chip select (cs ) a low level on this pin selects the device. a high level deselects the device and forces it into standby mode. however, a programming cycle which is already initiated or in progress will be completed, regardless of the cs input signal. if cs is brought high during a program cycle, the device will go into standby mode as soon as the programming cycle is complete. when the device is deselected, so goes to the high-impedance state, allowing multiple parts to share the same spi bus. a low-to-high transition on cs after a valid write sequence initiates an internal write cycle. after power- up, a low level on cs is required prior to any sequence being initiated. 3.2 serial output (so) the so pin is used to transfer data out of the 25xx320a. during a read cycle, data is shifted out on this pin after the falling edge of the serial clock. 3.3 write-protect (wp ) this pin is used in conjunction with the wpen bit in the status register to prohibit writes to the nonvolatile bits in the status register. when wp is low and wpen is high, writing to the nonvolatile bits in the sta- tus register is disabled. all other operations function normally. when wp is high, all functions, including writes to the nonvolatile bits in the status register operate normally. if the wpen bit is set, wp low during a status register write sequence will disable writing to the status register. if an internal write cycle has already begun, wp going low will have no effect on the write. the wp pin function is blocked when the wpen bit in the status register is low. this allows the user to install the 25xx320a in a system with wp pin grounded and still be able to write to the status register. the wp pin functions will be enabled when the wpen bit is set high. 3.4 serial input (si) the si pin is used to transfer data into the device. it receives instructions, addresses and data. data is latched on the rising edge of the serial clock. 3.5 serial clock (sck) the sck is used to synchronize the communication between a master and the 25xx320a. instructions, addresses or data present on the si pin are latched on the rising edge of the clock input, while data on the so pin is updated after the falling edge of the clock input. 3.6 hold (hold ) the hold pin is used to suspend transmission to the 25xx320a while in the middle of a serial sequence without having to retransmit the entire sequence again. it must be held high any time this function is not being used. once the device is selected and a serial sequence is underway, the hold pin may be pulled low to pause further serial communication without resetting the serial sequence. the hold pin must be brought low while sck is low, otherwise the hold function will not be invoked until the next sck high-to- low transition. the 25xx320a must remain selected during this sequence. the si, sck and so pins are in a high-impedance state during the time the device is paused and transitions on these pins will be ignored. to resume serial communication, hold must be brought high while the sck pin is low, otherwise serial communication will not resume. lowering the hold line at any time will tri-state the so line. name pin number x-rotated pin number function cs 1 3 chip select input so 2 4 serial data output wp 3 5 write-protect pin v ss 4 6 ground si 5 7 serial data input sck 6 8 serial clock input hold 7 1 hold input v cc 8 2 supply voltage
25aa320a/25lc320a ds21828d-page 14 ? 2007 microchip technology inc. 4.0 packaging information 4.1 package marking information note : custom marking available. 8-lead msop (150 mil) example: xxxxxt ywwnnn 5lbai 3281l7 t/xxxnnn xxxxxxxx yyww 8-lead pdip 8-lead soic xxxxyyww xxxxxxxt nnn xxxx tyww 8-lead tssop nnn i/p 1l7 25lc320a 0328 example: example: sn 0728 25lc32ai 1l7 1l7 5lba i328 example: msop 1st line marking device 25aa320a 25lc320a std mark tssop 1st line marking device 25aa320a 25lc320a std mark 5aba 5lba 5abat 5lbat legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week ?01?) nnn alphanumeric traceability code pb-free jedec designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e 3 e 3 e
? 2007 microchip technology inc. ds21828d-page 15 25aa320a/25lc320a 8-lead plastic micro small outline package (ms or ua) [msop] notes: 1. pin 1 visual index feature may vary, but must be located within the hatched area. 2. dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.15 mm per side. 3. dimensioning and tolerancing per asme y14.5m. bsc: basic dimension. theoretically exact value shown without tolerances. ref: reference dimension, usually without tolerance, for information purposes only. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging units millimeters dimension limits min nom max number of pins n 8 pitch e 0.65 bsc overall height a ? ? 1.10 molded package thickness a2 0.75 0.85 0.95 standoff a1 0.00 ? 0.15 overall width e 4.90 bsc molded package width e1 3.00 bsc overall length d 3.00 bsc foot length l 0.40 0.60 0.80 footprint l1 0.95 ref foot angle 0 ? 8 lead thickness c 0.08 ? 0.23 lead width b 0.22 ? 0.40 d n e e1 note 1 1 2 e b a a1 a2 c l1 l microchip technology drawing c04-111 b
25aa320a/25lc320a ds21828d-page 16 ? 2007 microchip technology inc. 8-lead plastic dual in-line (p or pa) ? 300 mil body [pdip] n otes: 1 . pin 1 visual index feature may vary, but must be located with the hatched area. 2 . significant characteristic. 3 . dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010" per side. 4 . dimensioning and tolerancing per asme y14.5m. bsc: basic dimension. theoretically exact value shown without tolerances. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging units inches dimension limits min nom max number of pins n 8 pitch e .100 bsc top to seating plane a ? ? .210 molded package thickness a2 .115 .130 .195 base to seating plane a1 .015 ? ? shoulder to shoulder width e .290 .310 .325 molded package width e1 .240 .250 .280 overall length d .348 .365 .400 tip to seating plane l .115 .130 .150 lead thickness c .008 .010 .015 upper lead width b1 .040 .060 .070 lower lead width b .014 .018 .022 overall row spacing eb ? ? .430 n e1 note 1 d 12 3 a a1 a2 l b1 b e e e b c microchip technology drawing c04-018 b
? 2007 microchip technology inc. ds21828d-page 17 25aa320a/25lc320a 8-lead plastic small outline (sn or oa) ? narrow, 3.90 mm body [soic] notes: 1. pin 1 visual index feature may vary, but must be located within the hatched area. 2. significant characteristic. 3. dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.15 mm per side. 4. dimensioning and tolerancing per asme y14.5m. bsc: basic dimension. theoretically exact value shown without tolerances. ref: reference dimension, usually without tolerance, for information purposes only. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging units millimeters dimension limits min nom max number of pins n 8 pitch e 1.27 bsc overall height a ? ? 1.75 molded package thickness a2 1.25 ? ? standoff a1 0.10 ? 0.25 overall width e 6.00 bsc molded package width e1 3.90 bsc overall length d 4.90 bsc chamfer (optional) h 0.25 ? 0.50 foot length l 0.40 ? 1.27 footprint l1 1.04 ref foot angle 0 ? 8 lead thickness c 0.17 ? 0.25 lead width b 0.31 ? 0.51 mold draft angle top 5 ? 15 mold draft angle bottom 5 ? 15 d n e e e1 note 1 12 3 b a a1 a2 l l1 c h h microchip technology drawing c04-057 b
25aa320a/25lc320a ds21828d-page 18 ? 2007 microchip technology inc. 8-lead plastic thin shrink small outline (st) ? 4.4 mm body [tssop] n otes: 1 . pin 1 visual index feature may vary, but must be located within the hatched area. 2 . dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.15 mm per side. 3 . dimensioning and tolerancing per asme y14.5m. bsc: basic dimension. theoretically exact value shown without tolerances. ref: reference dimension, usually without tolerance, for information purposes only. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging units millimeters dimension limits min nom max number of pins n 8 pitch e 0.65 bsc overall height a ? ? 1.20 molded package thickness a2 0.80 1.00 1.05 standoff a1 0.05 ? 0.15 overall width e 6.40 bsc molded package width e1 4.30 4.40 4.50 molded package length d 2.90 3.00 3.10 foot length l 0.45 0.60 0.75 footprint l1 1.00 ref foot angle 0 ? 8 lead thickness c 0.09 ? 0.20 lead width b 0.19 ? 0.30 d n e e1 note 1 12 b e c a a1 a2 l1 l microchip technology drawing c04-086 b
2007 microchip technology inc. ds21828d-page 19 25aa320a/25lc320a appendix a: revision history revision b corrections to section 1.0, electrical characteristics. revision c (2/2007) deleted x-rotated tssop; revised table 1-3; revised packaging information; replaced package drawings; revised product id system. revision d (03/2007) replaced package drawin g s (rev. am).
25aa320a/25lc320a ds21828d-page 20 ? 2007 microchip technology inc. notes:
? 2007 microchip technology inc. ds21828d-page 21 25aa320a/25lc320a the microchip web site microchip provides online support via our www site at www.microchip.com. this web site is used as a means to make files and information easily available to customers. accessible by using your favorite internet browser, the web site contains the following information: ? product support ? data sheets and errata, application notes and sample programs, design resources, user?s guides and hardware support documents, latest software releases and archived software ? general technical support ? frequently asked questions (faq), technical support requests, online discussion groups, microchip consultant program member listing ? business of microchip ? product selector and ordering guides, latest microchip press releases, listing of seminars and events, listings of microchip sales offices, distributors and factory representatives customer change notification service microchip?s customer notification service helps keep customers current on microchip products. subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. to register, access the microchip web site at www.microchip.com, click on customer change notification and follow the registration instructions. customer support users of microchip products can receive assistance through several channels: ? distributor or representative ? local sales office ? field application engineer (fae) ? technical support ? development systems information line customers should contact their distributor, representative or field application engineer (fae) for support. local sales offices are also available to help customers. a listing of sales offices and locations is included in the back of this document. technical support is available through the web site at: http://support.microchip.com
25aa320a/25lc320a ds21828d-page 22 ? 2007 microchip technology inc. reader response it is our intention to provide you with the best documentation possible to ensure successful use of your microchip prod- uct. if you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please fax your comments to the technical publications manager at (480) 792-4150. please list the following information, and use this outline to provide us with your comments about this document. to : technical publications manager re: reader response total pages sent ________ from: name company address city / state / zip / country telephone: (_______) _________ - _________ application (optional): would you like a reply? y n device: literature number: questions: fax: (______) _________ - _________ ds21828d 25aa320a/25lc320a 1. what are the best features of this document? 2. how does this document meet your hardware and software development needs? 3. do you find the organization of this document easy to follow? if not, why? 4. what additions to the document do you think would enhance the structure and subject? 5. what deletions from the document could be made without affecting the overall usefulness? 6. is there any incorrect or misleading information (what and where)? 7. how would you improve this document?
? 2007 microchip technology inc. ds21828d-page 23 25aa320a/25lc320a product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . part no. x /xx package tape & reel device device 25aa320a 25lc320a 32k-bit, 1.8v, 32 byte page, spi serial eeprom 32k-bit, 2.5v, 32 byte page, spi serial eeprom tape & reel blank = t= standard packaging ta p e & r e e l temperature range i= e= -40 c to+85 c -40 c to+125 c package ms = p= sn = st = plastic msop (micro small outline), 8-lead plastic dip (300 mil body), 8-lead plastic soic (3.90 mm body), 8-lead tssop, 8-lead examples: a) 25aa320a-i/ms = 32k-bit, 32-byte page, 1.8v serial eeprom, industrial temp., msop package b) 25aa320at-i/sn = 32k-bit, 32-byte page, 1.8v serial eeprom, industrial temp., tape & reel, soic package c) 25lc320at-e/sn = 32k-bit, 32-byte page, 2.5v serial eeprom, extended temp., tape & reel, soic package d) 25lc320at-i/st = 32k-bit, 32-byte page, 2.5v serial eeprom, industrial temp., tape & reel, tssop package ? x tem p range
25aa320a/25lc320a ds21828d-page 24 ? 2007 microchip technology inc. notes:
? 2007 microchip technology inc. ds21828d-page 25 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyer?s risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, accuron, dspic, k ee l oq , k ee l oq logo, micro id , mplab, pic, picmicro, picstart, pro mate, powersmart, rfpic, and smartshunt are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. amplab, filterlab, linear active thermistor, migratable memory, mxdev, mxlab, ps logo, seeval, smartsensor and the embedded control solutions company are registered trademarks of micr ochip technology incorporated in the u.s.a. analog-for-the-digital age, appl ication maestro, codeguard, dspicdem, dspicdem.net, dspicworks, ecan, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, mindi, miwi, mpasm, mplab certified logo, mplib, mplink, pickit, picdem, picdem.net, piclab, pictail, powercal, powerinfo, powermate, powe rtool, real ice, rflab, rfpicdem, select mode, smart serial, smarttel, total endurance, uni/o, wiperlock and zena are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of mi crochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2007, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. note the following details of the code protection feature on microchip devices: ? microchip products meet the specification cont ained in their particular microchip data sheet. ? microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip produc ts in a manner outside the operating specif ications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchip?s code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona, gresham, oregon and mountain view, california. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
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