MEMORY DATABOOK - Al Kossow's Bitsavers

OKI semiconductorMSM38256RS32768 WORD x 8 BIT MASK ROM (E3-S-029-321GENERAL DESCRIPTIONThe MSM38256RS is an N-channel silicon gate MOS device ROM with a 32,768 word x 8 bit capacity. It operateson a 5V single power supply and the all inputs and outputs are TTL compatible. The adoption of an asynchronoussystem 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 30mA (max) when the chip is not selected.The application of a byte system and the pin compatibility with standard UV EPROMs make the device most suitablefor use as a large-capacity fixed memory for microcomputers and data terminals.Since it provides CE, CS and OE signals, the connection of output terminals of other chips with the wired OR ispossible ensuring an easy expand operation of memory and bus line control.FEATURES• 32768 words x 8 bits• 5V single power supply• Access time: 250 ns MAX• Input/output TTL compatible.3-state output• Power down mode• 28-pin DIPFUNCTIONAL BLOCK DIAGRAMIIPIN CONFIGURATION(Top View) A.ICS)(NCI CS 1 28 v""A,A,A" 2 27 A ..A,A, 3 26 A" A.A. 4 25 A. A,A, 5 24 A, A.A. 6 23 AllA,A.A, 7 22 OE 10E)A,A, 8 21 A"A, 9 20 CEAllA. 10 19 D,Do 11 18 D.D, 12 17 D, A I4 O---D, 13 16 D.Vss 14 15 0 3CSChip Select~ Output enableVee, VIS Power supply voltageA.-A,. Address input~-07 Oata outputChip anable--aVe