Overview

The LC35256D, LC35256DM, and LC35256DT are

32768-word

× 8-bit asynchronous silicon gate CMOS

static RAMs. These devices use a 6-transistor full CMOS

memory cell, and feature low-voltage operation, low

current drain, and an ultralow standby current. They

provide two control signal inputs: an OE input for high-

speed access and a chip select (CE) input for device

selection and low power operating mode. This makes

these devices optimal for systems that require low power

or battery backup, and they allow memory to be expanded

easily. Their ultralow standby current allows capacitor-

based backup to be used as well. Since they support 3-V

operation, they are appropriate for use in portable systems

that operate from batteries.

Features

• Supply voltage range: 2.7 to 5.5 V

— 5-V operation:

5.0 V±10%

— 3-V operation:

2.7 to 3.6 V

• Access times

— 5-V operation

LC35256DM, DT-70:

70 ns (max)

LC35256D, DM, DT-10: 100 ns (max)

— 3-V operation

LC35256DM, DT-70:

200 ns (max)

LC35256D, DM, DT-10: 500 ns (max)

• Standby current

— 5-V operation: 1.0 µA (Ta

≤ 60°C),

5.0 µA (Ta

≤ 85°C)

— 3-V operation: 0.8 µA (Ta

≤ 60°C),

4.0 µA (Ta

≤ 85°C)

• Operating temperature range: –40 to +85°C

• Data retention supply voltage: 2.0 to 5.5 V

• All I/O levels

— 5-V operation: TTL compatible

• Shared I/O pins and 3-state outputs

• No clock signal required.

• Packages

— 28-pin DIP (600 mil) plastic package: LC35256D

— 28-pin SOP (450 mil) plastic package: LC35256DM

— 28-pin TSOP (8

× 13.4 mm) plastic package:

LC35256DT

Package Dimensions

unit: mm

3012A-DIP28

unit: mm

3187-SOP28D

unit: mm

3221-TSOP28(type-I)

CMOS IC

51398RM (OT) No. 5823-1/8

SANYO: DIP28

[LC35256D]

SANYO: SOP28D

[LC35256DM]

SANYO: TSOP28(type-I)

[LC35256DT]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Dual Control Pins: OE and CE

256K (32768-word

× 8-bit) SRAM

LC35256D-10, LC35256DM, DT-70/10

Ordering number : EN5823