M68AW256M datasheet(4/23 Pages) STMICROELECTRONICS

4 / 23 page

M68AW256M

4/23

SUMMARY DESCRIPTION

The M68AW256M is a 4 Mbit (4,194,304 bit)

CMOS SRAM, organized as 262,144 words by 16

bits. The device features fully static operation re-

quiring no external clocks or timing strobes, with

equal address access and cycle times. It requires

a single 2.7 to 3.6V supply. This device has an au-

tomatic power-down feature, reducing the power

consumption by over 99% when deselected.

The M68AW256 is available in TFBGA48 (6x8mm

- 6x8 active ball array, 0.75mm pitch), TFBGA48

(7x8mm - 6x8 active ball array, 0.75 mm pitch) and

in TSOP44 Type II packages.

In addition to the standard version, both packages

are also available in Lead-free version, in compli-

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

ECOPACK 7191395 Specification, and the RoHS

(Restriction of Hazardous Substances) directive.

All packages are compliant with Lead-free solder-

ing processes.

Figure 2. Logic Diagram

Table 1. Signal Names

AI04870b

A0-A17

DQ0-DQ15

VCC

M68AW256M

VSS

A0-A17

Address Inputs

DQ0-DQ15

Data Input/Output

Chip Enable

Output Enable

Write Enable

Upper Byte Enable Input

Lower Byte Enable Input

VCC

Supply Voltage

VSS

Ground

Not Connected Internally

Don’t Use as Internally Connected

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