81C55 データシートの表示（PDF） - Oki Electric Industry

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81C55

2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER

Oki Electric Industry 

¡ Semiconductor

Timer Waveforms 2

WR

TIMER IN

MSM81C55-5RS/GS/JS

Timer - Start

tTW

tWT

RAM DATA HOLD CHARACTERISTICS AT LOW SUPPLY VOLTAGE

Item

Data Holding Supply Voltage

Data Holding Supply Current

Setup Time

Hold Time

Symbol

VCCH

ICCH

tSU

tR

Condition

VIN = 0 V or VCC, ALE = 0 V

VCC = VCCH, ALE = 0

VIN = 0 V or VCC

Specification

Unit

Min. Typ. Max.

2.0

—

—V

—

0.05

20 mA

30

—

— ns

20

—

— ns

Two ways to place device in standby mode:

(1) Method using CE

5V

VCC

4.5 V

tSU

Standby Mode

tR

VCCH

tLA

ALE

0.8 V

0V

tAL

2.2 V

CE

VCCH

8/19

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