MEMORY DATABOOK - Al Kossow's Bitsavers

OKI semiconductorMSM51257RS/JS32,768-WORD x 8-BIT CMOS STATIC RAMGENERAL DESCRIPTIONThe MSM51257 RS/JS is a 327G8-word by 8-bit CMOS static RAM featuring 5V power supply operation and directTTL input/output compatibility. Since the circuitry is completely static, external clock and refreshing operationsare unnecessary, making this device very easy to use. The MSM51257RS/JS is also a CMOS silicon gate devicewhich requires very low power during standby (standby current of 1 mAl when there is no chip selection.CS and OE signals enable OR ties with the output terminals of other chips, thereby facilitating simple memory expansionand bus line control etc.FEATURES• Single 5V Supply• O"c - 70°C• Low Power DissipationStandby; 5.5 mW MAXOperation; 385mW MAX• High Speed (Equal Access and Cycle Time)85-120 ns MAX• Direct TTL Compatible. (Input and Output)• 3-State Output• 28-pin DIP PKG.32-pin PLCCPIN CONFIGURATIONDA6A,.{ .j(TOP VIEW)J u Z ~ I~ .jPIN CONFIGURATIONA,A,Ao -- A14 Address) NPUTSliD, - liD, ; Data Input/OutputCSChip SelectWE: Write EnableDE i Output EnableVcc, VSS ; Supply VoltageA,A,A,A,g g'" u z>g g gA"Ao-AI4 : Address INPUTSNC 1/0]-1108 : Data INPUT IOUTPUTOE CS : Chip SelectWE ; Write EnableA" 01' : OUTPUT EnableCS Vee, Vss : Supply Voltage1/0,1/07312