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54ACT520F

8-Bit Identity Comparator

National ->Texas Instruments 

September 1998

54AC520 • 54ACT520

8-Bit Identity Comparator

General Description

The ’AC/’ACT520 are expandable 8-bit comparators. They

compare two words of up to eight bits each and provide a

LOW output when the two words match bit for bit. The ex-

pansion input IA = B also serves as an active LOW enable in-

put.

Features

n Compares two 8-bit words in 6.5 ns typ

n Expandable to any word length

n 20-pin package

n Outputs source/sink 24 mA

n ’ACT520 has TTL-compatible inputs

n Standard Microcircuit Drawing (SMD)

54AC520: 5962-90916

54ACT520: 5962-89793

Logic Symbols

IEEE/IEC

DS100234-1

Pin Names

A0– A7

B0– B7

TA = B

OA = B

Description

Word A Inputs

Word B Inputs

Expansion or Enable Input

Identity Output

FACT™ is a trademark of Fairchild Semiconductor Corporation.

© 1998 National Semiconductor Corporation DS100234

DS100234-4

www.national.com

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