description the accutek ak632256aw sram module consists of eight fast high performance srams mounted on a low profile, 64 pin sim pcb. the module utilizes four 28 pin 256 k x 4 srams in 300 mil soj packages and four decoupling capacitor chips mounted on each side of a printed circuit board. the srams used have common i/o functions and single output en - able functions. also, four separate chip select (ce ) connections are used to independently enable the four bytes. the modules can be supplied in a variety of access time values from 12 nsec to 45 nsec in cmos or bicmos technology. the accutek module is designed to have a maximum seated height of 0.600 inch to provide for the lowest height off the board. by off - set-mounting the back surface srams the module can be mounted in either angled or straight-up sim sockets. the modules conform to jedec standard sizes and pin-out configurations. using two pins for module memory density identification, pd 0 and pd 1 , mini - mizes interchangeability and design considerations when changing from one module size to another in customer applications. features 262,144 x 32 bit organization jedec standardized 64 pin sim format available with solder or gold leads presence detect pd 0 and pd 1 for identifying module density common i/o, single oe functions with four separate chip selects (ce ) low height, 0.600 inch maximum seated height single 5 volt power suppy - ak632256aw single 3.3 volt power supply - ak632256aw/3.3 downward compatible with 128k x 32 (ak632128), 64k x 32 (ak63264) and 32k x 32 (ak63232) upward compatible with 512k x 32 (ak632512) and 1 meg x 32 (ak6321024) fast access times range from 12 nsec bicmos to 45 nsec cmos ttl-compatible inputs and outputs operating temperature range in free air, 0 0 cto70 0 c electrical specifications timing diagrams and basic electrical characteristics are those of the standard 256 k x 4 srams used to construct these modules. accutek?s module design allows the flexibility of selecting indus- try-compatible 256k x 4 srams from several semiconductor manu- facturers. accutek microcircuit corporation ak632256aw 262,144 x 32 bit cmos/bicmos static random access memory 64-pin sim top view 1 32 33 64 pin nomenclature a 0 -a 17 address inputs ce 1 -ce 4 chip enable dq 1 -dq 32 data in/data out oe output enable pd 0 -pd 1 presence detect vcc power supply vss ground we write enable module options leadless sim, solder leads: ak632256aw leadless sim, gold leads: ak632256awg pin assignment pin # symbol pin # symbol pin # symbol pin # symbol 1 vss 17 a2 33 ce 449 a4 2 pd0 18 a9 34 ce 3 50 a11 3 pd1 19 dq13 35 a17 51 a5 4 dq1 20 dq5 36 a16 52 a12 5 dq9 21 dq14 37 oe 53 vcc 6 dq2 22 dq6 38 vss 54 a13 7 dq10 23 dq15 39 dq25 55 a6 8 dq3 24 dq7 40 dq17 56 dq21 9 dq11 25 dq16 41 dq26 57 dq29 10 dq4 26 dq8 42 dq18 58 dq22 11 dq12 27 vss 43 dq27 59 dq30 12 vcc 28 we 44 dq19 60 dq23 13 a0 29 a15 45 dq28 61 dq31 14 a7 30 a14 46 dq20 62 dq24 15 a1 31 ce 2 47 a3 63 dq32 16 a8 32 ce 1 48 a10 64 vss pd 0 = vss pd 1 = vss functional diagram
ordering information part number coding interpretation position 12345678 1 product ak = accutek memory 2 type 4 = dynamic ram 5 = cmos dynamic ram 6 = static ram 3 organization/word width 1 = by 1 16 = by 16 4 = by 4 32 = by 32 8 = by 8 36 = by 36 9 = by 9 4 size/bits depth 64 = 64k 4096 = 4 meg 256 = 256k 8192 = 8 meg 1024 = 1 meg 16384 = 16 meg 5 package type g = single in-line package (sip) s = single in-line module (sim) d = dual in-line package (dip) w = .050 inch pitch edge connect z = zig-zag in-line package (zip) 6 special designation p = page mode n = nibble mode k = static column mode w = write per bit mode v = video ram 7 separator - = commercial 0 0 cto+70 0 c m = military equivalent screened (-55 0 c to +125 0 c) i = industrial temperature tested (-45 0 cto+85 0 c) x = burned in 8 speed (first two significant digits) drams srams 50 = 50 ns 8 = 8 ns 60 = 60 ns 10 = 10 ns 70 = 70 ns 12 = 12 ns 80 = 80 ns 15 = 15 ns 3.855 3.845 0.135 0.165 0.050 typ c l 1 0.600 max 0.350 max 0.425 0.375 c l c l c l c l c l 72 accutek microcircuit corporation business center at newburyport 2 new pasture road, suite 1 newburyport, ma 01950-4054 voice: 978-465-6200 fax: 978-462-3396 email: sales@accutekmicro.com internet: www.accutekmicro.com accutek reserves the right to make changes in specifications at any time and without notice. accutek does not assume any responsibility for the use of any circuitry described; no circuit patent licenses are implied. preliminary data sheets contain minimum and maximum limits based upon design objectives, which are subject to change upon full characterization over the specific operating conditions. mechanical dimensions inches the numbers and coding on this page do not include all variations available but are show as examples of the most widely used variations. contact accutek if other information is required. examples: AK632256AWG-12 256k x 32, 12 nsec sram module, sim configuration with gold leads ak632256aw-15 256k x 32, 15nsec sram module, sim configuration with solder leads
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