description the accutek AK68512D high density memory module is a static random access memory organized in 512 k x 8 bit words. the as - sembly consists of two medium speed 128 k x 8 srams in thin tsop packages and a cmos decoder logic ic mounted on the top side and two medium speed 128 k x 8 srams in thin tsop pack - ages mounted on the bottom surfaces of a printed circuit board. the module is supplied in a 600 mil wide,32 pin dip (dual in-line package) configuration. this pinout is completely compatible with forthcoming industry standard monolithic designs. these modules are intended for use in applications where limited board space dic - tates compact module designs. the operation of the AK68512D is identical to standard monolithic 8 bit word wide srams. the AK68512D offers the features of low power and medium speed by using cmos devices and makes high density mounting possible with no surface mount technology. features 524,28 8 x 8 bit organization fast access time: 85 - 120 nsec completely static ram, no clock or timing strobe required inputs and outputs ttl compatible conventional 600 mil wide sip package with industry compatible pinout single 5 volt power supply - AK68512D single 3.3 volt power supply - AK68512D/3.3 operating free air temperature 0 0 to 70 0 c electrical specifications timing diagrams and basic electrical characteristics are those of the standard 128 k x 8 srams used to construct these modules. accutek?s module design allows the flexibility of selecting indus- try-compatible 128 k x 8 srams from any of a number of semicon- ductor manufacturers. accutek microcircuit corporation AK68512D 524,28 8 x 8 bit cmos static random access memory 1 1 top view bottom view pin nomenclature dq 1 -dq 8 data in/data out a 0 -a 18 adress inputs ce chip enable we write enable vcc 5v supply vss ground oe output enable timing options 70 nsec access time 85 nsec access time 100 nsec access time 120 nsec access time pin assignment a a a a a a a a a a a a dq dq dq v 18 16 14 12 7 6 5 4 3 2 1 0 1 2 3 ss v a a we a a a a oe a ce dq dq dq dq dq cc 15 17 13 8 9 11 10 8 7 6 5 4 top view 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
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 2 . 1 0 0 + / - . 0 1 0 . 1 7 0 ma x 1 . 5 0 0 + / - . 0 1 5 . 1 0 0 t y p . 6 0 0 + / - . 0 0 6 . 0 1 2 . 0 0 8 . 0 1 8 + / - . 0 0 2 . 3 0 0 + / - . 0 1 0 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 im - plied. preliminary data sheets cont ain 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 avail - able but are show as examples of the most widely used variations. contact accutek if other information is required. examples: AK68512D-70 512k x 8, 70 nsec sram module, dip configuration
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