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256k x 32 static ram module cym1841a cym1841b cym1841c cypress semiconductor corporation ? 3901 north first street san jose ca 95134 408-943-2600 june 13, 2000 features ? high-density 8-megabit sram module 32-bit standard footprint supports densities from 16k x 32 through 1m x 32 high-speed cmos srams ? access time of 12 ns low active power ? 5.3w (max.) at 25 ns smd technology ttl-compatible inputs and outputs low profile ? max. height of 0.58 in. available in zip, simm, and angled simm footprint 72-pin simm version compatible with 1m x 32 (cym1851) functional description the cym1841a/b/c are high-performance 8-megabit static ram modules organized as 256k words by 32 bits. this mod- ule is constructed from eight 256k x 4 srams (1841a/c) or 256k x 16 srams (1841b) in soj packages mounted on an epoxy laminate board with pins. four chip selects (cs 1 , cs 2 , cs 3 , cs 4 ) are used to independently enable the four bytes. reading or writing can be executed on individual bytes or any combination of multiple bytes through proper use of selects. writing to each byte is accomplished when the appropriate chip select (cs ) and write enable (we ) inputs are both low. data on the input/output pins (i/o) is written into the memory location specified on the address pins (a 0 through a 17 ). reading the device is accomplished by taking the chip select (cs ) low while write enable (we ) remains high. under these conditions, the contents of the memory location speci- fied on the address pins will appear on the data input/output pins (i/o). the data input/output pins stay at the high-impedance state when write enable is low or the appropriate chip selects are high. two pins (pd 0 and pd 1 ) are used to identify module memory density in applications where alternate versions of the je- dec-standard modules can be interchanged. the cym1841a, cym1841b, and cym1841c are 100% pin, package, and electrically identical. the cym1841a utilizes corner power and ground srams, the cym1841b utilizes 256k x 16 srams, the cym1841c utilizes center power and ground srams. a 72-pin simm is offered for compatibility with the 1m x 32 cym1851. this version is socket upgradable to the cym1851. both the 64-pin and 72-pin simm modules are available with either tin-lead or 10 micro-inches of gold flash on the edge contacts. logic block diagram 1841a?1 a 0 ?a 17 oe i/o 0 ?i/o 3 cs 3 i/o 4 ?i/o 7 cs 1 18 4 4 4 4 4 4 4 4 cs 2 cs 4 i/o 8 ?i/o 11 i/o 16 ?i/o 19 i/o 24 ?i/o 27 i/o 12 ? i/o 15 i/o 20 ?i/o 23 i/o 28 ?i/o 31 pd 0 ?gnd pd 1 ?gnd pd 2 ? open (72-pin only) pd 3 ? open (72-pin only) we 256k x 4 sram 256k x 4 sram 256k x 4 sram 256k x 4 sram 256k x 4 sram 256k x 4 sram 256k x 4 sram 256k x 4 sram
cym1841a cym1841b cym1841c 2 logic block diagram (1841b) 1841a ? 1 a 0 ? a 17 oe cs 3 i/o 16 ? i/o 23 cs 1 18 8 8 8 8 cs 2 cs 4 i/o 24 ? i/o 31 i/o 0 ? i/o 7 i/o 8 ? i/o 15 pd 0 ? gnd pd 1 ? gnd pd 2 ? open (72-pin only) pd 3 ? open (72-pin only) we 256k x 16 sram 256k x 16 sram selection guide 1841c-12 1841b/c-15 1841a/b/c-20 1841a/b/c-25 1841a/b/c-35 1841a/b/c-45 maximum access time (ns) 12 15 20 25 35 45 maximum operating current (ma) 1600 1600 1120 960 960 960 maximum standby current (ma) 480 480 480 480 480 480 shaded areas contain preliminary information.
cym1841a cym1841b cym1841c 3 pin configurations cs we 1841a ? 2 simm top view nc a 4 pd 3 pd 2 pd 0 gnd i/o 0 pd 1 i/o 1 i/o 8 i/o 2 i/o 9 i/o 3 v cc a 7 i/o 11 i/o 10 a 0 i/o 6 gnd nc a 15 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 i/o 7 we a 8 a 9 i/o 4 i/o 5 a 14 cs 1 cs 3 a 16 gnd i/o 16 i/o 17 a 12 a 13 i/o 20 i/o 21 i/o 22 i/o 14 i/o 15 a 1 a 2 i/o 12 i/o 13 2 i/o 18 i/o 19 a 10 a 11 cs 4 a 17 oe i/o 24 i/o 25 v cc a 6 i/o 28 i/o 29 i/o 26 i/o 27 a 3 a 5 66 68 70 65 67 69 i/o 23 gnd a 19 i/o 30 i/o 31 a 18 72 71 nc nc 1841a ? 3 zip/simm top view pd 0 v cc i/o 0 pd 1 i/o 1 i/o 8 i/o 2 i/o 9 i/o 3 i/o 10 v cc i/o 11 a 7 a 8 a 9 a 1 a 0 a 2 cs 2 gnd cs 4 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 a 14 cs 1 i/o 4 i/o 5 i/o 6 7 cs 3 a 16 gnd i/o 16 i/o 17 i/o 18 i/o 19 i/o 20 i/o 21 i/o 22 i/o 23 gnd gnd a i/o 12 i/o 13 i/o 14 i/o 15 a 17 a 10 a 11 a 12 a 13 oe i/o 24 i/o 25 i/o 26 i/o 27 i/o 28 i/o 29 i/o 30 i/o 31 a 3 a 4 a 5 a 6 64-pin 72-pin 15 i/o
cym1841a cym1841b cym1841c 4 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 to ground potential .................. ? 0.5v to +7.0v dc voltage applied to outputs in high z state ..................................................... ? 0.5v to +7.0v dc input voltage ................................................. ? 0.5v to +7.0v operating range range ambient temperature v cc commercial 0 c to +70 c 5v 10% electrical characteristics over the operating range parame- ter description test conditions 1841c - 12 1841b/c - 15 1841a/b/c -20 1841a/b/c -25, 35, 45 unit min. max. min. max. min. max. v oh output high voltage v cc = min., i oh = ? 4.0 ma 2.4 2.4 2.4 v v ol output low voltage v cc = min., i ol = 8.0 ma 0.4 0.4 0.4 v v ih input high voltage 2.2 v cc 2.2 v cc 2.2 v cc v v il input low voltage ? 0.5 0.8 ? 0.5 0.8 ? 0.5 0.8 v i ix input leak- age current gnd < v i < v cc ? 16 +16 ? 16 +16 ? 16 +16 ma i oz output leak- age current gnd < v o < v cc , output disabled ? 10 +10 ? 10 +10 ? 10 +10 ma i cc v cc operat- ing supply cur- rent v cc = max., i out = 0 ma, cs < v il 1600 1120 960 ma i sb1 automatic cs power-down current [1] max. v cc , cs > v ih , min. duty cycle = 100% 480 480 480 ma i sb2 automatic cs power-down current [1] max. v cc , cs > v cc - 0.2v, v in > v cc ? 0.2v, or v in < 0.2v 240 200 200 ma capacitance [2] parameter description test conditions max. unit c in input capacitance [3] t a = 25 c, f = 1 mhz, v cc = 5.0v 70/20 pf c out output capacitance 20 pf notes: 1. a pull-up resistor to v cc on the cs input is required to keep the device deselected during v cc power-up, otherwise i sb will exceed values given. 2. tested on a sample basis. 3. 20 pf on cs , 70 pf all others.
cym1841a cym1841b cym1841c 5 ac test loads and waveforms 1841a ? 4 1841a ? 5 90% 10% 3.0v gnd 90% 10% all input pulses 5v output 30 pf including jig and scope 5v output 5 pf including jig and scope (a) (b) <5ns <5 ns output r1481 ? r1481 ? r2 255 ? r2 255 ? 167 ? equivalent to: th venin equivalent 1.73v
cym1841a cym1841b cym1841c 6 switching characteristics over the operating range [4] 1841c-12 1841b/c-15 1841a/b/c-20 1841a/b/c-25 parameter description min. max. min. max. min. max. min. max. unit read cycle t rc read cycle time 12 15 20 25 ns t aa address to data valid 12 15 20 25 ns t oha output hold from address change 3 333ns t acs cs low to data valid 12 15 20 25 ns t doe oe low to data valid 7 8 13 15 ns t lzoe oe low to low z 0 000ns t hzoe oe high to high z 7 8 15 15 ns t lzcs cs low to low z [5] 3 31010ns t hzcs cs high to high z [5, 6] 7 8 20 20 ns t pd cs high to power-down 12 15 20 25 write cycle [7] t wc write cycle time 12 15 20 25 ns t scs cs low to write end 9 10 15 20 ns t aw address set-up to write end 9 10 18 20 ns t ha address hold from write end 0 000ns t sa address set-up to write start 2 222ns t pwe we pulse width 10 13 15 20 ns t sd data set-up to write end 7 81315ns t hd data hold from write end 1 122ns t lzwe we high to low z 0 000ns t hzwe we low to high z [6] 0 507015015ns shaded areas contain preliminary information. notes: 4. test conditions assume signal transition times of 5 ns or less, timing reference levels of 1.5v, input pulse levels of 0 to 3 .0v, and output loading of the specified i ol /i oh and 30-pf load capacitance. 5. at any given temperature and voltage condition, t hzcs is less than t lzcs for any given device. these parameters are guaranteed by design and not 100% tested. 6. t hzcs and t hzwe are specified with c l = 5 pf as in part (b) of ac test loads and waveforms. transition is measured 500 mv from steady-state voltage. 7. the internal write time of the memory is defined by the overlap of cs low and we low. both signals must be low to initiate a write and either signal can terminate a write by going high. the data input set-up and hold timing should be referenced to the rising edge of the signal th at terminates the write.
cym1841a cym1841b cym1841c 7 switching characteristics over the operating range [4 1841a/b/c-35 1841a/b/c-45 parameter description min. max. min. max. unit read cycle t rc read cycle time 35 45 ns t aa address to data valid 35 45 ns t oha data hold from address change 3 3 ns t acs cs low to data valid 35 45 ns t doe oe low to data valid 25 30 ns t lzoe oe low to low z 0 0 ns t hzoe oe low to high z 15 15 ns t lzcs cs low to low z [5] 10 10 ns t hzcs cs high to high z [5, 6] 20 20 ns t pd cs high to power-down 35 45 ns write cycle [7] t wc write cycle time 35 45 ns t scs cs low to write end 30 40 ns t aw address set-up to write end 30 40 ns t ha address hold from write end 2 2 ns t sa address set-up to write start 2 2 ns t pwe we pulse width 30 35 ns t sd data set-up to write end 20 25 ns t hd data hold from write end 2 2 ns t lzwe we high to low z 0 0 ns t hzwe we low to high z [6] 015015ns
cym1841a cym1841b cym1841c 8 switching waveforms read cycle no. 1 [8, 9] read cycle no. 2 [8, 10] write cycle no. 1 (we controlled) [7] notes: 8. we is high for read cycle. 9. device is continuously selected, cs = v il and oe = v il . 10. address valid prior to or coincident with cs transition low. previous data valid data valid t rc t aa t oha 1841a ? 6 address data out data valid t rc t acs t doe t lzoe t lzcs high impedance t hzoe t hzcs high impedance 1841a ? 7 data out oe cs t wc data valid data undefined high impedance t scs t aw t sa t pwe t ha t hd t hzwe t lzwe t sd cs we 1841a ? 8 address data in data out
cym1841a cym1841b cym1841c 9 write cycle no. 2 (cs controlled) [7, 11] note: 11. if cs goes high simultaneously with we high, the output remains in a high-impedance state. switching waveforms (continued) t wc data valid data undefined high impedance t scs t aw t pwe t ha t hd t hzwe t sd cs we 1841a ? 9 address data in data out t sa truth table cs we oe input/output mode h x x high z deselect/power-down l h l data out read l l x data in write l h h high z deselect
cym1841a cym1841b cym1841c 10 ordering information speed (ns) ordering code package name package type operating range 12 cym1841cpm-12c pm02 64-pin plastic simm module commercial cym1841cp7-12c pm04 72-pin plastic simm module cym1841cpz-12c pz03 64-pin plastic zip module 15 cym1841apm15c pm02 64-pin plastic simm module commercial cym1841apy-15c pm01 64-pin plastic simm module (gold contacts) cym1841apt-15c pm01 64-pin plastic simm module cym1841ap5-15c pn04 72-pin plastic angled simm module cym1841ap6-15c pm01 72-pin plastic angled simm module (gold contacts) cym1841ap7-15c pm04 72-pin plastic simm module cym1841ap8-15c pm04 72-pin plastic simm module (gold contacts) cym1841apn-15c pn02 64-pin plastic angled simm module cym1841apr-15c pz01 64-pin plastic zip module cym1841apz-15c pz03 64-pin plastic zip module cym1841bpz-15c pz03 64-pin plastic zip module cym1841bp7-15c pm04 72-pin plastic simm module 20 cym1841apm-20c pm02 64-pin plastic simm module commercial CYM1841APY-20C pm01 64-pin plastic simm module (gold contacts) cym1841apt-20c pm01 64-pin plastic simm module cym1841ap5-20c pn04 72-pin plastic angled simm module cym1841ap6-20c pm01 72-pin plastic angled simm module (gold contacts) cym1841ap7-20c pm04 72-pin plastic simm module cym1841ap8-20c pm04 72-pin plastic simm module (gold contacts) cym1841apn-20c pn02 64-pin plastic angled simm module cym1841apr-20c pz01 64-pin plastic zip module cym1841apz-20c pz03 64-pin plastic zip module cym1841bpz-20c pz03 64-pin plastic zip module cym1841bp7-20c pm04 72-pin plastic simm module 25 cym1841apm-25c pm02 64-pin plastic simm module commercial cym1841apy-25c pm01 64-pin plastic simm module (gold contacts) cym1841apt-25c pm01 64-pin plastic simm module cym1841ap5-25c pn04 72-pin plastic angled simm module cym1841ap6-25c pm01 72-pin plastic angled simm module (gold contacts) cym1841ap7-25c pm04 72-pin plastic simm module cym1841ap8-25c pm04 72-pin plastic simm module (gold contacts) cym1841apn-25c pn02 64-pin plastic angled simm module cym1841apr-25c pz01 64-pin plastic zip module cym1841apz-25c pz03 64-pin plastic zip module cym1841bpz-25c pz03 64-pin plastic zip module cym1841bp7-25c pm04 72-pin plastic simm module shaded areas contain preliminary information.
cym1841a cym1841b cym1841c 11 document #: 38-m-00031-g 35 cym1841apm-35c pm02 64-pin plastic simm module commercial cym1841apy-35c pm01 64-pin plastic simm module (gold contacts) cym1841apt-35c pm01 64-pin plastic simm module cym1841ap5-35c pn04 72-pin plastic angled simm module cym1841ap6-35c pm01 72-pin plastic angled simm module (gold contacts) cym1841ap7-35c pm04 72-pin plastic simm module cym1841ap8-35c pm04 72-pin plastic simm module (gold contacts) cym1841apn-35c pn02 64-pin plastic angled simm module cym1841apr-35c pz01 64-pin plastic zip module cym1841apz-35c pz03 64-pin plastic zip module cym1841bpz-35c pz03 64-pin plastic zip module cym1841bp7-35c pm04 72-pin plastic simm module 45 cym1841apm-45c pm02 64-pin plastic simm module commercial cym1841apy-45c pm01 64-pin plastic simm module (gold contacts) cym1841apt-45c pm01 64-pin plastic simm module cym1841ap5-45c pn04 72-pin plastic angled simm module cym1841ap6-45c pm01 72-pin plastic angled simm module (gold contacts) cym1841ap7-45c pm04 72-pin plastic simm module cym1841ap8-45c pm04 72-pin plastic simm module (gold contacts) cym1841apn-45c pn02 64-pin plastic angled simm module cym1841apr-45c pz01 64-pin plastic zip module cym1841apz-45c pz03 64-pin plastic zip module cym1841bpz-45c pz03 64-pin plastic zip module cym1841bp7-45c pm04 72-pin plastic simm module ordering information (continued) speed (ns) ordering code package name package type operating range
cym1841a cym1841b cym1841c 12 package diagrams v 3.580 3.588 3.845 0.525 0.145 ref 0.400 0.250 0.080 pin 1 0.250 pin 64 0.62 r .001 + 3.35 (64 pins) 0.250 0.125 dia. .001 2 plcs + 0.330 0.050 typ 3.855 max max 64-pin plastic simm module pm01 64-pin plastic simm module pm02 3.580 3.588 0.135 ref 0.400 0.250 0.080 pin 1 0.250 pin 64 0.62 r .001 + (64 pins) 0.250 0.125 dia. .001 2 plcs + 0.350 0.050 typ 3.845 3.855 max 0.585 0.595 3.348 3.352 72-pin plastic simm module pm04
cym1841a cym1841b cym1841c 13 package diagrams (continued) 64-pin plastic angled simm module pn02 3.845/3.855 3.580/3.588 .350max .220ref .670/.680 .245/.255 .397/.403 pin1 .075/.085 .050typ .061/.063r .249/.251 3.348/3.352 .245/.255 72-pin plastic angled simm module pn04 min. max. 3.640 3.660 0.050 typ 0.330 0.008 0.014 0.120 0.150 0.050 0.050 0.135 0.165 0.015 0.025 0.250 typ 0.100 typ 0.500 max max 0.100 typ dimensions in inches 64-pin plastic zip module pz01 bottom view pin 1
cym1841a cym1841b cym1841c ? cypress semiconductor corporation, 2000. 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 ing so indemnifies cypress semiconductor against all charges. package diagrams (continued) min. max. 3.640 3.660 0.050 typ 0.350 0.120 0.150 0.050 0.050 0.135 0.165 0.015 0.025 0.250 typ 0.100 typ 0.575 max max 0.100 typ dimensionsininches bottom view pin 1 64-pin plastic zip module pz03

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