M68AF031A datasheet(4/22 Pages) STMICROELECTRONICS

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M68AF031A

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SUMMARY DESCRIPTION

The M68AF031A is a 256 Kbit (262,144 bit) CMOS

SRAM, organized as 32,768 bytes. The device

features fully static operation requiring no external

clocks or timing strobes, with equal address ac-

cess and cycle times. It requires a single 4.5 to

5.5V supply. This device has an automatic power-

down feature, reducing the power consumption by

over 99% when deselected.

The M68AF031A is available in SO28 (28-lead

Small Outline), PDIP28 (28-pin Plastic Dual-In-

Line) and TSOP28 (28-lead Thin Small Outline,

Standard and Reverse Pinout) packages.

In addition to the standard version, the TSOP28

Standard package is also available in Lead-free

version (standard and Tape & Reel packing), in

compliance with JEDEC Std J-STD-020B, the ST

ECOPACK 7191395 Specification, and the RoHS

(Restriction of Hazardous Substances) directive. It

is also compliant with Lead-free soldering pro-

cesses.

Figure 2. Logic Diagram

Table 1. Signal Names

AI05920C

A0-A14

DQ0-DQ7

VCC

M68AF031A

VSS

A0-A14

Address Inputs

DQ0-DQ7

Data Input/Output

Chip Enable

Output Enable

Write Enable

VCC

Supply Voltage

VSS

Ground

Not Connected Internally

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