81C55 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

81C55

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

Oki Electric Industry 

¡ Semiconductor

MSM81C55-5RS/GS/JS

(6) Standby Mode (see page 7)

The MSM81C55-5 is placed in standby mode when the high level at the CE input is latched

during the negative going edge of ALE. All input ports and the timer input should be pulled

up or down to either VCC or GND potential.

When using battery back-up, all ports should be set low or in input port mode. The timer

output should be set low. Otherwise, a buffer should be added to the timer output and the

battery should be connected to the power supply pins of the buffer.

By setting the reset input to a high level, the standby mode can be selected. In this case, the

command register is reset, so the ports automatically set to the input mode and the timer

stops.

14/19

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