HT23C128 データシートの表示（PDF） - Holtek Semiconductor

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HT23C128

CMOS 16K×8-Bit Mask ROM

Holtek Semiconductor 

HT23C128

Functional Description

The HT23C128 has two modes, namely data

read mode and standby mode, controlled by

CE/CE/OE2/OE2, OE/OE/NC and OE1/OE1/NC

inputs.

• Standby mode

The HT23C128 has lower current consumption,

controlled by the chip enable input (CE/CE).

When a low/high level is applied to the CE/CEB

input regardless of the output enable

(OE/OE/NC and OE1/OE1/NC) states, the chip

will enter the standby mode.

• Data read mode

When both the chip enable (CE/CE/OE2/OE2)

and the output enable (OE/OE/NC and

OE1/OE1/NC) are active, the chip is in data

read mode. Otherwise, active CE/CE and in-

active OE/OE/NC or OE1/OE1/NC result in

deselect mode. The output will remain in Hi-Z

state.

Timing Diagrams

• Propagation delay due to address (CE/CE/OE2/OE2, OE/OE and OE1/OE1 are active)

• Propagation delay due to chip enable and output enable (address valid)

5

24th Aug ’98

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