GENERAL DESCRIPTION
The ’AC/’ACT520 are expandable 8-bit comparators. 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 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. 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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