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BLOCK DIAGRAM

32 k × 8

SRAM

Block

OE

WE

A

DQ

Power-Fail

Control

Power

CE

CON

CE

V

CC

+

Lithium

Cell

UDG-06075

DIP MODULE

bq4011/Y/LY

MA PACKAGE

bq4011/Y/LY

SLUS118A – MAY 1999 – REVISED MAY 2007

85 ms maximum in 3.3-V system) to allow for processor stabilization. Normal memory operation may resume

after this time.

The internal coin cells used by the bq4011/Y/LY have an extremely long shelf life and provide data retention for

more than 10 years in the absence of system power.

As shipped from TI, the integral lithium cells of the MT-type module are electrically isolated from the memory.

isolation is broken, and the lithium backup provides data retention on subsequent power-downs.

TRUTH TABLE

MODE

CE

WE

OE

I/O OPERATION

POWER

Not selected

H

X

X

High-Z

Standby

Output disable

L

H

H

High-Z

Active

Read

L

H

L

Active

Write

L

L

X

Active

3

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