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National Semiconductor Electronic Components Datasheet

54AC520 Datasheet

8-Bit Identity Comparator

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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
FACTis a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100234
DS100234-4
www.national.com


National Semiconductor Electronic Components Datasheet

54AC520 Datasheet

8-Bit Identity Comparator

No Preview Available !

Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
Truth Table
Inputs
IA = B
L
L
H
H
A, B
A = B*
AB
A = B*
AB
H = HIGH Voltage Level
L = LOW Voltage Level
*A0 = B0, A1 = B1, A2 = B2, etc.
DS100234-2
Outputs
OA = B
L
H
H
H
DS100234-3
www.national.com
2


Part Number 54AC520
Description 8-Bit Identity Comparator
Maker National Semiconductor
Total Page 10 Pages
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