54FCT521 8-Bit Identity Comparator
September 1998
54FCT521
8-Bit Identity Comparator
General Description
The 鈥橣CT521 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
A = B
also serves as an active LOW enable input.
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 Assignment
for DIP and CERPACK
DS100968-1
IEEE/IEC
DS100968-2
Pin Assignment
for LCC
DS100968-4
DS100968-3
Pin Descriptions
Pin Names
A
0
鈥揂
7
B
0
鈥揃
7
T
A = B
O
A = B
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
Description
FACT
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is a trademark of Fairchild Semiconductor Corporation.
漏 1998 National Semiconductor Corporation
DS100968
www.national.com
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