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256k x 36 dual i/o, dual address synchronous sram CY7C1301A cypress semiconductor corporation ? 3901 north first street san jose ca 95134 408-943-2600 document # 38-05076 rev. *c revised january 19, 2003 features ? fast clock speed: 100 and 83 mhz fast access times: 5.0/6.0 ns max. single clock operation single 3.3v ?5% and +5% power supply vcc separate v ccq for output buffer two chip enables for simple depth expansion address, data input, ce1x , ce2x, ce1y , ce2y, ptx , pty , wex , wey , and data output registers on-chip concurrent reads and writes two bidirectional data buses can be configured as separate i/o pass-through feature asynchronous output enables (oex , oey ) lvttl-compatible i/o self-timed write automatic power-down 176-pin tqfp package functional description the CY7C1301A sram integrates 262,144 x 36 sram cells with advanced synchronous peripheral circuitry. it employs high-speed, low-power cmos designs using advanced triple-layer polysilicon, double-layer metal technology. each memory cell consists of four transistors and two high-valued resistors. the CY7C1301A allows the user to concurrently perform reads, writes, or pass-through cycles in combination on the two data ports. the two address ports (ax, ay) determine the read or write locations for their respective data ports (dqx, dqy). all input pins except output enable pins (oex , oey ) are gated by registers controlled by a positive-edge-triggered clock input (clk). the synchronous inputs include all addresses, all data inputs, depth-expansion chip enables (ce1x , ce2x, ce1y and ce2y), pass-through controls (ptx and pty ), and read-write control (wex and wey ). the pass-through feature allows data to be passed from one port to the other, in either direction. the ptx input must be asserted to pass data from port x to port y. the pty will likewise pass data from port y to port x. a pass-through operation takes precedence over a read operation. for the case when ax and ay are the same, certain protocols are followed. if both ports are read, the reads occur normally. if one port is written and the other is read, the read from the array will occur before the data is written. if both ports are written, only the data on dqy will be written to the array. the CY7C1301A operates from a +3.3v power supply. all inputs and outputs are lvttl-compatible. these dual i/o, dual address synchronous srams are well suited for atm, ethernet switches, routers, cell/frame buffers, sna switches and shared memory applications. the CY7C1301A device needs one extra cycle after power for proper power on reset. the extra cycle is needed after v cc is stable on the device. this device is available in a 176-pin tqfp package. note: 1. for 256 36 device, ax and ay are 18-bit-wide buses. data in register oex# *ax 256k/128k x 9 x 4 sram array dqx clk 18/17 ce1x# ce2x address register address register write x register write driver sensing amplifiers sensing amplifiers write driver write y register pass-through ptx register data in register output register output register chip enable register chip enable register dqy wex# ptx# ay* wey# pty# ptx register clk 18/17 oey# ce1y# ce2y chip enable register chip enable register logic block diagram [1]
CY7C1301A document # 38-05076 rev. *c page 2 of 13 . selection guide -100 -83 unit maximum access time 5.0 6.0 ns maximum operating current 500 430 ma maximum cmos standby current 140 120 ma pin configuration 132 vss 45 vss 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 133 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 vss vccq dqy35 dqx35 vss vss ay5 ax5 vss vcc ax14 ay14 vccq vss dqx1 dqy1 vss dqx0 dqy0 ax13 ay13 ax12 ay12 ax11 ay11 ax10 ay10 ay4 ax4 ay3 ax3 ay2 ax2 ay1 ax1 ay0 ax0 dqy34 dqx34 dqx20 dqy20 vss vccq dqx21 dqy21 dqx22 dqy22 vss vccq dqx23 dqy23 dqx24 dqy24 vss vccq dqx25 dqy25 dqx26 dqy26 vss vcc dqy27 dqx27 dqy28 dqx28 vss vccq dqy29 dqx29 dqy30 dqx30 vss vccq dqy31 dqx31 dqy32 dqx32 vss vccq dqy33 dqx33 vss vss dqx15 dqy15 vccq vss dqx14 dqy14 dqx13 dqy13 vccq vss dqx12 dqy12 dqx11 dqy11 vccq vss dqx10 dqy10 dqx9 dqy9 vcc vss dqy8 dqx8 dqy7 dqx7 vccq vss dqy6 dqx6 dqy5 dqx5 vccq vss dqy4 dqx4 dqy3 dqx3 vccq vss dqy2 dqx2 vss vss vss vccq dqy18 dqx18 ax6 ay6 ax7 ay7 vcc vss ax8 ay8 ax9 vcc vss dqx16 dqy16 vss dqx17 dqy17 ay9 ax17* ay17* pty# ptx# wey# wex# ce2x ce1x# oey# oex# vss nc nc nc vss nc nc clk dqy19 dqx19 ax16 ay16 ax15 ay15 ce2y ce1y# 176-pin tqfp
CY7C1301A document # 38-05076 rev. *c page 3 of 13 pin definitions (176-pin tqfp) pin name i/o pin description ax0 ? ax1 7 input- synchronous synchronous address inputs of port x : do not allow address pins to float. ay0 ? ay17 input- synchronous synchronous address inputs of port y : do not allow address pins to float. wex input- synchronous read write of port x : wex signal is a synchronous input that identifies whether the current loaded cycle is a read or write operation. wey input- synchronous read write of port y : wey signal is a synchronous input that identifies whether the current loaded cycle is a read or write operation. ptx input- synchronous pass-through of port x : ptx signal is a synchronous input that enables passing port x input to port y output. pty input- synchronous pass-through of port y : pty signal is a synchronous input that enables passing port y input to port x output. oex input asynchronous output enable of port x : oex must be low to read data. when oex is high, the dqxx pins are in high-impedance state. oey input asynchronous output enable of port y : oey must be low to read data. when oey is high, the dqyx pins are in high-impedance state. dqx0 ? dqx35 input/ output data inputs/outputs of port x : both the data input path and data output path are registered and triggered by the rising edge of clk. dqy0 ? dqy35 input/ output data inputs/outputs of port y : both the data input path and data output path are registered and triggered by the rising edge of clk. clk input- synchronous clock : this is the clock input to this device. except for oex and oey , all timing references of the address, data in, and all control signals for the device are made with respect to the rising edge of clk. ce1x input- synchronous synchronous active low chip enable port x : ce1x is used with ce2x to enable port x of this device. ce1x sampled high at the rising edge of clock initiates a deselect cycle for port x. ce2x input- synchronous synchronous active high chip enable port x : ce2x is used with ce1x to enable port x of this device. ce2x sampled low at the rising edge of clock initiates a deselect cycle for port x. ce1y input- synchronous synchronous active low chip enable port y : ce1y is used with ce2y to enable port y of this device. ce1y sampled high at the rising edge of clock initiates a deselect cycle for port y. ce2y input- synchronous synchronous active high chip enable port y : ce2y is used with ce1y to enable port y of this device. ce2y sampled low at the rising edge of clock initiates a deselect cycle for port y. v cc supply power supply : +3.3v ? 5% and +5%. v ss ground ground : gnd. v ss ground ground : gnd. no chip current flows through these pins. however, user needs to connect gnd to these pins. pins 140 and 141 are v ss for 128k 36 device. v ccq i/o supply output buffer supply : +3.3v ? 5% and +5%. nc ? no connect : these signals are not internally connected. user can connect them to v cc , v ss , or any signal lines or simply leave them floating.
CY7C1301A document # 38-05076 rev. *c page 4 of 13 cycle description truth table [2, 3, 4, 5, 6, 7, 8, 9] operation ce1x ce2x ce1y ce2y wex wey ptx pty deselect cycle h x h x x x x x deselect cycle x l x l x x x x write port x l hxx0xxx write port y x x l h x 0 x x pass-through from x to y l h l h x x 0 x pass-through from y to x l h l h x x x 0 read port x l h x x 1 x 1 1 read port y x xlhx111 notes: 2. x means ? don ? t care. ? h means logic high. l means logic low. 3. all inputs except oex and oey must meet set-up and hold times around the rising edge (low to high) of clk. 4. oex and oey must be asserted to avoid bus contention during write and pass-through cycles. for a write and pass-through operation followin g a read operation, oex /oey must be high before the input data required set-up time plus high-z time for oex /oey and staying high throughout the input data hold time. 5. operation number 3 ? 6 can be used in any combination. 6. operation numbers 4 and 7, 3 and 8, and 7 and 8 can be combined. 7. operation number 5 can not be combined with operation number 7 or 8 because pass-through operations have higher priority over a read operation. 8. operation number 6 can not be combined with operation number 7 or 8 because pass-through operations have higher priority over a read operation. 9. this device contains circuitry that will ensure the outputs will be in high-z during power-up.
CY7C1301A document # 38-05076 rev. *c page 5 of 13 maximum ratings (above which the useful life may be impaired. for user guide- lines, not tested.) storage temperature ..................................... ? 55 c to +125 c ambient temperature with power applied .................................................... ? 10 c to +85 c supply voltage on v dd relative to gnd .........? 0.5v to +4.6v dc voltage applied to outputs in high z state [10] ....................................? 0.5v to v ccq + 0.5v dc input voltage [10] ................................ ? 0.5v to v ccq + 0.5v current into outputs (low)......................................... 20 ma static discharge voltage .......................................... >1601v (per mil-std-883, method 3015) latch-up current ................................................... > 200 ma operating range range ambient temperature [11] v dd /v ddq (12) commercial 0 c to +70 c 3.3v 5% electrical characteristics over the operating range parame- ter description test conditions min. max. unit v dd power supply voltage 3.135 3.465 v v ddq i/o supply voltage 3.135 3.465 v v oh output high voltage v dd = min., i oh = ? 4.0 ma 2.4 v v ol output low voltage v dd = min., i ol = 8.0 ma 0.4 v v ih input high voltage [13] 2.0 v cc + 0.5v v v il input low voltage [14] ? 0.5 0.8 v i x input load current gnd v in v ddq ? 5 5 a i oz output leakage current gnd v in v ddq, output disabled ? 5 5 a i cc v dd operating supply v dd = max., i out = 0 ma, f = f max = 1/t cyc 10.0 ns cycle 100 mhz 500 ma 12.0 ns cycle 83 mhz 430 ma i sb automatic ce power-down current ? cmos inputs max. v dd , device deselected [15] , v in 0.3v or v in > v ddq ? 0.3v, f = 0 10.0 ns cycle100 mhzs 140 ma 12.0 ns cycle 83mhz 120 ma capacitance [18] parameter description test conditions max. unit c in input capacitance t a = 25 c, f = 1 mhz, v cc = 3.3v, v ccq = 3.3v 8 pf c clk clock input capacitance 9 pf c i/o input/output capacitance 8 pf notes: 10. minimum voltage equals ? 2.0v for pulse duration less than 20 ns. 11. t a is the case temperature. 12. power supply ramp up should be monotonic. 13. overshoot: v ih +6.0v for t t kc /2 . 14. undershoot:v il ? 2.0v for t t kc /2 . 15. ? device deselected ? means the device is in power-down mode as defined in the truth table. 16. tested initially and after any design or process change that may affect these parameters.
CY7C1301A document # 38-05076 rev. *c page 6 of 13 ac test loads and waveforms [17,18] thermal resistance [16] description test conditions symbol tqfp typ. units thermal resistance (junction to ambient) (@200 lfm) single-layer printed circuit board ja 40 c/w thermal resistance (junction to ambient) (@200 lfm) four-layer printed circuit board jc 35 c/w thermal resistance (junction to board) bottom ja 23 c/w thermal resistance (junction to case) to p jc 9 c/w notes: 17. ac test conditions assume signal transition time of 1 ns or less, timing reference levels of 1.5v, input pulse levels of 0 t o 3.0v, and output loading shown in part (a) of ac test loads. 18. overshoot: vih(ac) CY7C1301A document # 38-05076 rev. *c page 7 of 13 switching characteristics over the operating range [17, 19, 20] -100 -83 parameter description min. max. min. max. unit clock t kc clock cycle time 10 12 ns t kh clock high time 3.5 4.0 ns t kl clock low time 3.5 4.0 ns output times t kq clock to output valid 5.0 6.0 ns t kqx clock to output invalid 1.5 1.5 ns t kqlz clock to output in low-z [21] 0 0 ns t kqhz clock to output in high-z [21] 3.0 3.0 ns t oeq oex /oey to output valid 5.0 6.0 ns t oelz oex /oey to output in low-z [21] 0 0 ns t oehz oex /oey to output in high-z [21] 3.0 3.0 ns set-up times t s addresses, controls and data in 1.8 2.0 ns hold times t h addresses, controls and data in 0.5 0.5 ns notes: 19. t chz , t clz , t oev , t eolz , and t eohz are specified with ac test conditions shown in part (a) of ac test loads. transition is measured 200 mv from steady-state voltage. 20. at any given voltage and temperature, t eohz is less than t eolz and t chz is less than t clz to eliminate bus contention between srams when sharing the same data bus. these specifications do not imply a bus contention condition, but reflect parameters guaranteed over worst case user conditions. device is designed to achieve high-z prior to low-z under the same system conditions. 21. this parameter is sampled and not 100% tested. 22. ce low means (ce1x and ce1y ) equals low and (ce2x and ce2y) equals high. ce high means (ce1x and ce1y ) equals high or (ce2x and ce2y) equals low.
CY7C1301A document # 38-05076 rev. *c page 8 of 13 switching waveforms [22] read cycle timing from both ports (wex , wey , ptx , pty high) [21] clk ax ce# (see note) oex# dqx 2 t kq t oelz t h t s t kh t kl t kc t oeq 1 4 3 6 5 8 7 9 q(1) q(2) q(3) q(5) q(6) q(7) oey# dqy q(12) q(13) q(14) q(16) q(6) q(7) ay 13 12 15 14 6 16 19 7 20 t h t s t kqhz t kq t oehz t kqlz port x port y
CY7C1301A document # 38-05076 rev. *c page 9 of 13 switching waveforms (continued) [22] clk ax ce# (see note) oex# dqx 2 t h t s t kh t kl t kc 1 4 3 6 5 8 7 9 d(3) oey# dqy ay 13 12 15 14 6 5 19 18 20 t h t s wex# wey# port x port y d(2) d(4) d(8) d(9) d(14) d(15) d(19) d(5) d(6) d(18) t h t s port y takes priority over port x when ax=ay and writing to both write cycle timing to both ports (ptx , pty high) [21]
CY7C1301A document # 38-05076 rev. *c page 10 of 13 switching waveforms (continued) [22] clk ax ce# (see note) oex# dqx 2 t h t s t kh t kl t kc 1 4 3 6 5 8 7 9 d(3) oey# dqy ay 13 12 15 14 17 16 19 18 20 wex# wey# port x port y d(2) d(x) pty# pty# d(y) d(6) q(3) d(x) d(y) q(17) t kqhz t kq t kqx t s t h write to port x and pass-through to port y [21] ptx#
CY7C1301A document # 38-05076 rev. *c page 11 of 13 switching waveforms (continued) [22] 3 clk ax oex# dqx 2 t h t s t kh t kl t kc 1 1 2 oey# dqy ay wex# wey# port x port y d(def) port y takes priority over port x when ax=ay and writing to both ports. d(abc) q(pqr) q(xyz) q(jkl) d(xyz) d(pqr) q(jkl) d(jkl) q(pqr) try to write try to write read read read read read read 3 2 1 1 2 write write read read read read read read ptx# = pty# = high d(value) = value is the input of the data port. q(value) = value is the output of the data port. combination read/write with same address on each port
CY7C1301A document # 38-05076 rev. *c page 12 of 13 ? cypress semiconductor corporation, 2002. the information contained herein is subject to change without notice. cypress semico nductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress semiconductor product. nor does it convey or imply any license unde r patent or other rights. cypress semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected t o result in significant injury to the user. the inclusion of cypress semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in do i ng so indemnifies cypress semiconductor against all charges. all product and company names mentioned in this document are the trademarks of their respective holders. ordering information speed (mhz) ordering code package name package type operating range 100 CY7C1301A-100ac a176 176-lead tqfp (24 x 24 x 1.4 mm) commercial 83 CY7C1301A-83ac a176 176-lead tqfp (24 x 24 x 1.4 mm) package diagram 176-lead thin quad flat pack (24x24x1.4 mm) a176 51-85132
CY7C1301A document # 38-05076 rev. *c page 13 of 13 document title: CY7C1301A 256k x 36 dual i/o, dual address synchronous sram document: 38-05076 rev. ecn no. issue date orig. of change description of change ** 107305 06/08/01 nsl new data sheet *a 109297 09/07/01 cjm 1. remove 133-mhz speed bin 2. change esd voltage from > 2001v to > 1601v 3. change t s from 1.5 ns to 1.8 ns *b 113340 04/11/02 glc 1. changed isb from 100 ma to140 ma for 100 mhz and 100 ma to 120 ma for 83 mhz 2. changed c in from 6 pf to 8 pf (all speeds) 3. changed c clk from 6pf to 9 pf (all speeds) 4. changed icc to reflect chara data (all speeds) 5. removed preliminary *c 123845 01/19/03 ajh updated power-up requirements in operating range and in ac test loads and waveforms .

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