MEMORY DATABOOK - Al Kossow's Bitsavers

OKI semiconductorMSM38256ARS32768 WORD x 8 BIT MASK ROM (E3-S-030-32)GENERAL DESCRIPTIONThe MSM38256ARS is an N·channel silicon gate E/DMOS device ROM with a 32,768 word x 8 bit capacity. Itoperates on a 5V single power supply and the all inputs and outputs are TTL compatible. The adoption of an asyn·chronous system in the circuit requires no external clock assuring extremely easy operation. The availability of powerdown mode contributes to the low power dissipation which is as low as 6mA (max) when the chip is not selected. Theapplication of a byte system and the pin compatibility with standard UV EPROMs make the device most suitable foruse as a large-capacity fixed memory for microcomputers and data terminals.Since it provides CE, DE, CS signals, the connection of output terminals of other chips with the wired OR is possibleensuring an easy expand operation of memory and bus line control.FEATURES• 32768 words x 8 bits• 5V single power supply• Access time: 150 ns MAX• Input/output TTL compatible• 3-5ta18 output• Power down mode• 28-pin DIPFUNCTIONAL BLOCK DIAGRAMPIN CONFIGURATION(Top View)ICSICSINCI I 28 VeeCEDE(CS) CSVee, VssA.-A,.De-D,(NC)A" 2 27 A ..A, 3 26 A"A" 4 25 A.A, 5 24 A,A,. 6 23 AuA, 7 22 DEA, 8 21 A"A, 9 20 crAo to 19 0,Do 11 18 0,0, 12 17 0,0, 13 16 D.VSS 14 15 D3Chip enableOutput enableChip selectPower supply voltageAddress inputData outputNo ConnectionNote: CS active level is specifiedby customers.A.A,A,A,A.A,A,A,A.A,A"AuA"A"A I4o--bufferCE.OE,CSControl--0 Vec--0 V ..DEL-__ .r~cs0,CSmNC338