©

1990, 1993, 1994

DATA SHEET

MOS INTEGRATED CIRCUIT

256K-BIT CMOS STATIC RAM

32K-WORD BY 8-BIT

Description

The

µPD43256B is a high speed, low power, and 262, 144 bits (32,768 words by 8 bits) CMOS static RAM.

Battery backup is available (L, LL, A, and B versions). And A and B versions are wide voltage operations.

The

µPD43256B is packed in 28-pin plastic DIP, 28-pin plastic SOP and 28-pin plastic TSOP (I).

Features

•

32,768 words by 8 bits organization

•

Fast access time: 70, 85, 100, 120, 150 ns (MAX.)

•

•

2 V data retention

•

OE input for easy application

Access time

Operating

Operating

Standby

Data retention

Part number

ns (MAX.)

supply voltage

temperature

supply current

V

°C

µA (MAX.)

µA (MAX.)

µPD43256B-L

70, 85

4.5 to 5.5

0 to 70

50

3

µPD43256B-LL

70, 85

15

2

µPD43256B-A

3.0 to 5.5

100, 120, 150

2.7 to 5.5

Version X and P

This data sheet can be applied to the version X and P. Each version is identified with its lot number. Letter X in

the fifth character position in a lot number signifies version X, letter P, version P.

The information in this document is subject to change without notice.

The mark

shows major revised points.

Document No. M10770EJ9V0DS00 (9th edition)

Date Published May 1997 N

Printed in Japan

D43256B

JAPAN

Lot number