HD74HC85
4-bit Magnitude Comparator
REJ03D0555-0200
(Previous ADE-205-427)
Rev.2.00
Oct 06, 2005
Description
The HD74HC85 is designed for high speed comparison of two four bit words. This circuit has eight comparison input,
4 for each word; three cascade inputs (A < B, A > B, A = B); and three decision outputs (A < B, A > B, A = B). The
result of a comparison is indicated by a high level on one of the decision outputs. Thus it may be determined whether
one word is “greater than,” “less than,” or “equal to” the other word. By connecting the outputs of the least significant
stage to the cascade inputs of the next stage, words of greater than four bits can be compared. In addition the least
significant stage must have a high level applied to the A = B input, and a low level to the A < B, and A > B inputs.
Features
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High Speed Operation: tpd (Data Word Input to Output) = 20 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Ordering Information
Part Name
Package Type
HD74HC85P
DILP-16 pin
HD74HC85FPEL
SOP-16 pin (JEITA)
HD74HC85RPEL
SOP-16 pin (JEDEC)
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
PRSP0016DH-B
(FP-16DAV)
PRSP0016DG-A
(FP-16DNV)
Package
Abbreviation
P
—
FP
EL (2,000 pcs/reel)
RP
EL (2,500 pcs/reel)
Note: Please consult the sales office for the above package availability.
Rev.2.00, Oct 06, 2005 page 1 of 7
Taping Abbreviation
(Quantity)
