© 1999 Fairchild Semiconductor Corporation DS009545 www.fairchildsemi.com
April 1988
Revised August 1999
7
4F521 8-Bi
t Ident
it
y C
o
m
par
ator
74F521
8-Bit Identity Comparator
General Description
The 74F521 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
a73 Compares two 8-bit words in 6.5 ns typ
a73 Expandable to any word length
a73 20-pin package

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Order Number Package Number Package Description
74F521SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F521SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F521MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74F521PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide