HT23C020 データシートの表示（PDF） - Holtek Semiconductor

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HT23C020

CMOS 256K×8-Bit Mask ROM

Holtek Semiconductor 

HT23C020

CMOS 256K×8-Bit Mask ROM

Features

• Operating voltage 2.7V~5.5V

• Low power consumption

– Operation: 25mA max. (VCC=5V)

10mA max. (VCC=3V)

– Standby: 30µA max. (VCC=5V)

10µA max. (VCC=3V)

• Access time:150ns max. (VCC=5V)

250ns max. (VCC=3V)

• 262144×8 bits of mask ROM

• Mask options: chip enable CE/CE/OE1/OE1,

CE1/CE1/OE2/OE2/NC and output enable

OE/OE/NC

• TTL compatible inputs and outputs

• Tristate outputs

• Fully static operation

• Package type: 32-pin DIP/SOP/PLCC

General Description

The HT23C020 is a read-only memory with

high performance CMOS storage device whose

2048K of memory is arranged into 262144

words by 8 bits.

For application flexibility, the chip enable and

output enable control pins can be selected as

active high or active low. This flexibility not

only allows easy interface with most microproc-

essors, but also eliminates bus contention in

multiple bus microprocessor systems. An addi-

tional feature of the HT23C020 is its ability to

enter the standby mode whenever the chip en-

able (CE/CE or CE1/CE1) is inactive, thus re-

ducing current consumption to below 30µA. The

combination of these functions make the chip

suitable for high density low power memory

applications.

Block Diagram

1

21st Aug ’98

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