54FCT521

8-Bit Identity Comparator

General Description

The ’FCT521 is an expandable 8-bit comparator. It com-

pares two words of up to eight bits each and provides a LOW

output when the two words match bit for bit. The expansion

input I

Features

n Expandable to any word length

n Outputs sink capability of 32mA, source capability of 12

mA

n TTL input and output level compatible

n CMOS power consumption

n Standard microcircuit Drawing (SMD) 5962-8854301

Logic Symbols

Connection Diagram

Pin Descriptions

Pin Names

Description

Word A Inputs

Word B Inputs

Expansion or Enable Input

Identity Output

DS100968-1

IEEE/IEC

DS100968-4

Pin Assignment

for DIP and CERPACK

DS100968-2

Pin Assignment

for LCC

DS100968-3

September 1998

© 1998 National Semiconductor Corporation

DS100968

www.national.com