23C256 데이터 시트보기 (PDF) - Holtek Semiconductor

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23C256

CMOS 32K×8-Bit Mask ROM

Holtek Semiconductor 

Pin Assignment

HT23C256

Pin Description

Pin Name

A0~A14

D0~D7

CE/CE/OE1/OE1

OE/OE/NC

VSS

VCC

NC

I/O

Description

I Address inputs

O Data outputs

I Chip enable/Output enable input

I Output enable input

I Negative power supply

I Positive power supply

— No connection

Operation Truth Table

Mode

Read

Deselect

Standby

CE/CE

H/L

H/L

L/H

Note: H=VIH, L=VIL, X=VIH or VIL

OE/OE

H/L

L/H

X

A0~A14

Valid

X

X

D0~D7

Data Out

High Z

High Z

2

24th Aug ’98

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