54AC521 Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – 8-Bit Identity Comparator

September 1998
54AC521 • 54ACT521
8-Bit Identity Comparator
General Description
The AC/ACT521 is an expandable 8-bit comparator. It com-
pares two words of up to eight bits each and provides a LOW
output when the two words match bit for bit. The expansion
input I_{A = B} also serves as an active LOW enable input.
Features
n I_CC reduced by 50%
n Compares two 8-bit words in 6.5 ns typ
n Expandable to any word length
n Outputs source/sink 24 mA
n ACT521 has TTL-compatible inputs
n Standard microcircuit Drawing (SMD)
54AC521: 5962-90985
54ACT521: 5962-89793
Logic Symbols
Connection Diagram
Pin Assignment
for DIP and CERPACK
IEEE/IEC
DS100291-1
DS100291-2
Pin Assignment
for LCC
DS100291-4
DS100291-3
Pin Descriptions
Pin Names
A₀–A₇
B₀–B₇
T_A = _B
O_A = _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 DS100291
www.national.com