®

2

ALLIANCE SEMICONDUCTOR

10/6/00

AS6WA5128

Functional description

The AS6WA5128 is a low-power CMOS 4,194,304-bit Static Random Access Memory (SRAM) device organized as

524,288 words × 8 bits. It is designed for memory applications where slow data access, low power, and simple interfacing

are desired.

selects (CS) permit easy memory expansion with multiple-bank memory systems.

When CS is high, the device enters standby mode: the AS6WA5128 is guaranteed not to exceed 72

µW power consumption

A write cycle is accomplished by asserting write enable ( WE) and chip select (CS) low. Data on the input pins I/O1–I/O8 is

written on the rising edge of WE (write cycle 1) or CS (write cycle 2).To avoid bus contention, external devices should drive

I/O pins only after outputs have been disabled with output enable (OE) or write enable (WE).

A read cycle is accomplished by asserting output enable (OE), chip select (CS), with write enable (WE) High. The chip

drives I/O pins with the data word referenced by the input address. When either chip select or output enable is inactive, or

write enable is active, output drivers stay in high-impedance mode.

All chip inputs and outputs are CMOS-compatible, and operation is from a single 3.0 to 3.6V supply. The device is available

in the JEDEC standard 36(48)-ball FBGA package.

Absolute maximum ratings

Note: Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and func-

tional operation of the device at these or any other conditions outside those indicated in the operational sections of this spec ification is not implied. Expo-

sure to absolute maximum rating conditions for extended periods may affect reliability.

Truth table

Key: X = Don’t care, L = Low, H = High.

Parameter

Device

Symbol

Min

Max

Unit

–0.5

V

Voltage on any I/O pin relative to GND

–0.5

V

Power dissipation

–1.0

W

Storage temperature (plastic)

–65

+150

°C

–55

+125

°C

DC output current (low)

–20

mA

CS

WE

OE

Supply Current

I/O1–I/O8

Mode

HX

X

High Z

LX

X

High Z

LH

H

High Z

LH

L

LL

X