NSC 5962-9091601MSA, 5962-9091601MRA, 5962-9091601M2A, 5962-9091601BSA Datasheet
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 expansion input I
A=B
also serves asanactive 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–A7
Word A Inputs
B
0–B7
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
Connection Diagrams
Truth Table
Inputs Outputs
I
A=B
A, B O
A=B
LA
=
B
*
L
LA
≠
BH
HA
=
B
*
H
HA
≠
BH
H
=
HIGH Voltage Level
L=LOW Voltage Level
*
A
0
=
B
0,A1
=
B
1,A2
=
B
2
, etc.
Pin Assignment
for DIP and Flatpak
DS100234-2
Pin Assignment
for LCC
DS100234-3
www.national.com 2
Logic Diagram
DS100234-5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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