de scrip tion t he accut ek AK616256D sra m mod ule con sists of four fast high per for mance sram s mounted on a low pro file 48 pin di p board. t he mod ule uti lizes f our 28 pin 256k x 4 srams in soj pac kages and four de coup ling ca pac i tors m ounted on a print ed cir cuit board. t he srams us ed have com mon i/ o func tions and si n gle out put en - able func tions. also, f our sep a rate chip s e lect ( cs ) con nec tions are used to in de pend ently en able the four chips. t he mod ules can be sup plied in a va ri ety of ac cess t ime val ues from 12nsec to 45ns ec in cmos or bicmo s tech nol ogy. t he accut ek mod ule is de signed to have a m ax i mum seat ed height of 0.230 inc h to pro vide for t he low est height off t he board. eac h con forms to jede c stan dard sizes and pin-out con fig u ra tions. fea tures ? 262,144 x 16 bit or ga ni za tion ? jedec st an dard ized 48 pin di p ? com mon i/ o w ith four sep a rate chip s e lects ( cs ) ? low height 0.230 inc h dip maximum ? fast ac cess t imes range f rom 12 nsec bicmo s to 45nse c cmos ? t t l-com pat i ble in puts and out puts ? sin gle 5 volt power sup ply - AK616256D ? sin gle 3.3 volt pow er sup ply - AK616256D-3.3 ? op er at ing free air tem per a t ure 0 0 c to 70 0 c elec tri cal specifications t im ing di a grams and ba sic elec tri cal char ac t er is ti cs are those of the st an dard 256k x 4 srams used to cons truct these mod ules. accut ek's mod ule de sign al low s the flex i bil ity of se lect i ng in dus try- com pat i ble 256k x 4 srams f rom sev eral semi con duc tor manufact rurers . a c c u t e k m i c r o c i r c u i t c o r p o r a t i o n AK616256D 262,144 x 16 bit cmos/bicm os stati c ran dom ac cess mem ory pin no men cla ture a 0 - a 17 ad dress in puts cs 1 - cs 4 chip select dq 0 - dq 15 data in/ date out we l - we u writ e en able vcc 5v sup ply vss ground nc no con nect mod ule op tions dip: AK616256D pin as sign menta16 pin # sym bol pin # sym bol pin # symbol pin # sym bol 1 gnd 13 a 9 25 gnd 37 a 8 2 nc 14 a 10 26 nc 38 a 7 3 a 0 15 a 11 27 a 17 39 a 6 4 a 1 16 a 12 28 a 16 40 a 5 5 a 2 17 a 13 29 a 15 41 a 4 6 we l 18 we u 30 a 14 42 a 3 7 cs 2 19 cs 4 31 cs 3 43 cs 1 8 d 4 20 d 12 32 d 11 44 d 3 9 d 5 21 d 13 33 d 10 45 d 2 10 d 6 22 d 14 34 d 9 46 d 1 11 d 7 23 d 15 35 d 8 47 d 0 12 gnd 24 vcc 36 vcc 48 vcc ex am ples a k616256d-12 256k x 16, 12 nsec sr am mod ule, dip a k616256d-15 256k x 16, 15nsec sr am mod ule, dip
func tional di a gram me chan i cal di men sions order in for ma tion part number coding in ter pre ta tion po si tion 1 2 3 4 5 6 7 8 1 prod uct ak = a ccutek mem ory 2 type 4 = dy namic ram 5 = cmos dy namic ra m 6 = static ram 3 or ga ni z a tion/w ord width 1 = b y 1 16 = by 16 4 = by 4 32 = by 32 8 = by 8 36 = by 36 9 = by 9 4 size/bi ts depth 64 = 64k 4096 = 4 meg 256 = 256k 8192 = 8 meg 1024 = 1 meg 16384 = 16 meg the num bers and cod ing on this page do not in clude all vari a tions avail able, but are shown as ex am ples of the most widely used vari a tions. con tact accutek if other in for ma tion is re quired. po si tion 1 2 3 4 5 6 7 8 5 pack age ty pe g = sin gle in-line pack age (sip) s = sin gle in-line m od ule (sim ) d = dual in-line pack age (dip) w = .050 inch pitch edge co n nect z = zig-zag in-line p ack age (zip) 6 spe cial des ig na tion p = page mode n = nib ble mode k = static col umn mode w = write per bit mode v = video ram 7 sep a ra tor - = com mer cial 0 0 c to +70 0 c m = mil i tary equiv a lent screened (-55 0 c to +125 0 c) i = in dus trial tem per a ture tested (-45 0 c to +85 0 c) x = burned in 8 speed (first two sig nif i cant dig its) drams srams 50 = 50 ns 8 = 8 ns 60 = 60 ns 12 = 12 ns 70 = 70 ns 15 = 15 ns a c c u t e k m i c r o c i r c u i t c o r p o r a t i o n 5 n e w p a s t u r e r o a d n e w b u r y p o r t , m a 0 1 9 5 0 - 4 0 4 0 p h o n e : 9 7 8 - 4 6 5 - 6 2 0 0 f a x : 9 7 8 - 4 6 2 - 3 3 9 6 e m a i l : s a l e s @ a c c u t e k m i c r o . c o m i n t e r n e t : w w w . a c c u t e k m i c r o . c o m accutek re serves the right to make c hanges in spec i fi ca tions at any time and with out no tice. acc utek does not as sume any re spon si bil ity for the use of any cir cuitry de scribed; no ci r cuit pat ent li censes are im plied. pre lim i nary data sheets con tain min i mum and max i mum lim its based upon de sign ob - jec tives, which are sub ject to change upon full char ac ter iza tion over the spe - cific op er at ing con di tions . 0 . 9 0 0 " + 0 . 0 1 0 " - 0 . 0 1 0 " 0 . 1 6 0 " + 0 . 0 1 0 " - 0 . 0 1 0 " 0 . 2 3 0 " 2 . 4 0 0 " + 0 . 0 2 5 " - 0 . 0 2 5 " 2 5 6 k x 4 s r a m 2 5 6 k x 4 s r a m 2 5 6 k x 4 s r a m 2 5 6 k x 4 s r a m p i n # 1 0 . 1 0 0 " + 0 . 0 0 5 " - 0 . 0 0 5 " 0 . 0 2 0 " + 0 . 0 0 1 " - 0 . 0 0 1 " m a x
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