8-Bit Identity Comparator
www.DataSheet4U.com
54AC520 • 54ACT520 8-Bit Identity Comparator
September 1998
54AC520 • 54ACT520 8-Bit Identity Com...
Description
www.DataSheet4U.com
54AC520 54ACT520 8-Bit Identity Comparator
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 expansion input IA = B also serves as an active LOW enable input. n n n n n Expandable to any word length 20-pin package Outputs source/sink 24 mA ’ACT520 has TTL-compatible inputs Standard Microcircuit Drawing (SMD) 54AC520: 5962-90916 54ACT520: 5962-89793
Features
n Compares two 8-bit words in 6.5 ns typ
Logic Symbols
IEEE/IEC
DS100234-1
DS100234-4
Pin Names A0–A7 B0–B7 TA = B OA = B
Description Word A Inputs Word B Inputs Expansion or Enable Input Identity Output
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100234
www.national.com
Connection Diagrams
Pin Assignment for DIP and Flatpak Pin Assignment for LCC
DS100234-3
DS100234-2
Truth Table
Inputs IA = B L L H H A, B A = B* A≠B A = B* A≠B Outputs OA = B L H H H
H = HIGH Voltage Level L = LOW Voltage Level *A0 = B0, A1 = B1, A2 = B2, etc.
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.
3
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please ...
Similar Datasheet