Rev.2.00 Mar 30, 2006 page 1 of 6

HD74HC682, HD74HC684

8-bit Magnitude Comparator

REJ03D0642-0200

(Previous ADE-205-528)

Rev.2.00

Mar 30, 2006

Description

These magnitude comparators perform comparisons of two eight-bit binary or BCD words. All types provide

P=Q

outputs and provide

P>Q outputs. The HD74HC682 features 20 kΩ pullup termination resistors on the Q inputs for

analog or switch data.

Type

P=Q

P>Q

Output Enable

20 k

Ω Pullup

HD74HC682

Yes

Yes

No

Yes

HD74HC684

Yes

Yes

No

No

Features

• High Speed Operation

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74HC682P

HD74HC684P

DILP-20 pin

PRDP0020AC-B

(DP-20NEV)

P

—

HD74HC682RPEL

HD74HC684RPEL

SOP-20 pin (JEDEC)

PRSP0020DC-A

(FP-20DBV)

RP

EL (1,000 pcs/reel)

Function Table

Input Data

Outputs

P, Q

P=Q

P>Q

P = Q

L

H

P > Q

H

L

P < Q

H

H

Note:

1. The

P<Q function can be generated by applying the P=Q and P>Q Outputs to a 2-input NAND gate.

H :

high level

L

:

low level