National-Semiconductor-54AC520.pdf
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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 I
A
=
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
Pin Names Description
A
0
–A
7
Word A Inputs
B
0
–B
7
Word B Inputs
T
A
=
B
Expansion or Enable Input
O
A
=
B
Identity Output
FACT
™
is a trademark of Fairchild Semiconductor Corporation.
DS100234-1
IEEE/IEC
DS100234-4
September 1998
54AC520
•
54ACT520 8-Bit Identity Comparator
© 1998 National Semiconductor Corporation DS100234 www.national.com
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