TL/F/9545
54F/74F521
8-Bit
Identity
Comparator
May 1995
54F/74F521
8-Bit Identity Comparator
General Description
The ’F521 is an expandable 8-bit comparator. It compares
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
AeB
also serves as an active LOW enable input.
Features
Y
Compares two 8-bit words in 6.5 ns typ
Y
Expandable to any word length
Y
20-pin package
Commercial Military
Package
Package Description
Number
74F521PC N20A 20-Lead (0.300 Wide) Molded Dual-In-Line
54F521DM (Note 2) J20A 20-Lead Ceramic Dual-In-Line
74F521SC (Note 1) M20B 20-Lead (0.300 Wide) Molded Small Outline, JEDEC
74F521SJ (Note 1) M20D 20-Lead (0.300 Wide) Molded Small Outline, EIAJ
74F521MSA (Note 1) MSA20 20-Lead Molded Shrink Small Outline, EIAJ type II
Note 1: Devices also available in 13 reel. Use suffix e SCX, SJX and MSAX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB.
Logic Symbols
TL/F/9545–1
IEEE/IEC
TL/F/9545–4
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.