GENERAL DESCRIPTION
The AC/ACT521 is an expandable 8-bit comparator. The expansion input IA = B also serves as an active LOW enable input. FEATURES
n n n n n n ICC reduced by 50% Compares two 8-bit words in 6.5 ns typ Expandable to any word length Outputs source/sink 24 mA ACT521 has TTL-compatible inputs Standard microcircuit Drawing (SMD) 54AC521: 5962-90985 54ACT521: 5962-89793 Logic Symbols Connection Diagram Pin Assignment for DIP and CERPACK DS100291-1 IEEE/IEC DS100291-2 Pin Assignment for LCC DS100291-4 DS100291-3 Pin Descriptions Pin Names A0–A7 B0–B7 TA = B OA = B Word A Inputs Word B Inputs Expansion or Enable Input Identity Output DESCRIPTION
FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100291 Truth Table Inputs IA = B L L H H H = HIGH Voltage Level L = LOW Voltage Level Note 1: A0 = B0, A1 = B1, A2 = B2, etc. Outputs A, B OA = B L H H H A = B (Note 1) A≠B A = B (Note 1) A≠B Logic Diagram DS100291-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
National Semiconductor
