Pin Description

Pin Name

I/O

Description

NC

¾

No connection

A0~A18

I

Address inputs

D0~D7

O

Data outputs

VSS

¾

Negative power supply

CE/CE/OE1/OE1

I

Chip enable/Output enable input

OE/OE/NC

I

Output enable input

VCC

¾

Positive power supply

Operation Truth Table

Mode

CE/CE

OE/OE

A0~A18

D0~D7

Read

H/L

H/L

Valid

Data Out

Deselect

H/L

L/H

X

High Z

Standby

L/H

X

X

High Z

Absolute Maximum Ratings

Supply Voltage.................................-0.3V to 6V

Storage Temperature.................-50°Cto125°C

Operating Temperature ..............-40°Cto85°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² may cause substantial damage to the device. Functional operation of this device

at other conditions beyond those listed in the specification is not implied and prolonged expo-

sure to extreme conditions may affect device reliability.

HT23C040

3

January 20, 2000