Ordering number : ENN*6302

52600RM (OT) No. 6302-1/7

Overview

The LC35256FM and LC35256FT are asynchronous

silicon-gate CMOS SRAMs with a 32K-word by 8-bit

structure. These are full-CMOS devices with 6 transistors

per memory cell, and feature low-voltage operation, a low

operating current drain, and an ultralow standby current.

Control inputs include OE for fast memory access and CE

(chip enable) for power saving and device selection. This

makes these devices optimal for systems that require low

power or battery backup, and makes memory expansion

easy. The ultralow standby current allows these devices to

be used with capacitor backup as well.

Features

• Supply voltage range: 4.5 to 5.5 V

• Access time at 5 V operation:

LC35256FM, FT-55U: 55 ns (maximum)

LC35256FM, FT-70U: 70 ns (maximum)

• Standby current: 3.0 µA (Ta

≤ 70°C)

5.0 µA (Ta

≤ 85°C)

• Operating temperature: –40 to +85°C

• Data retention voltage: 2.0 to 5.5 V

• All I/O levels: TTL compatible

• Input/output shared function pins, 3-state output pins

• No clock required

• Package

28-pin SOP (450 mil) plastic package: LC35256FM

28-pin TSOP (8

× 13.4 mm) plastic package: LC35256FT

Package Dimensions

unit: mm

3187A-SOP28D

unit: mm

3221-TSOP28 (Type I)

Preliminary

LC35256FM, FT-55U/70U

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

256K (32768 words

× 8 bits) SRAM

Control Pins: OE and CE

CMOS IC

1

14

15

28

18.0

1.27

0.4

0.15

SANYO: SOP28D

[LC35256FM]

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

0.55

22

7

21

8

1

28

8.1

0.2

0.125

SANYO: TSOP28 (Type I)

[LC35256FT]