Rev.2.00, Feb.18.2005, page 1 of 6

HD74LS85

4-bit Magnitude Comparator

REJ03D0421–0200

Rev.2.00

Feb.18.2005

This four bit magnitude comparator performs comparison of straight binary and straight BCD (8-4-2-1) codes. Three

fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. This

device is fully expandable to any number of bits without external gates. Words of greater length may be compared by

connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits. The

stage handling the least- significant bits must have a high-level voltage applied to the A

β B input. The cascading path

is implemented with only a two-gate-level delay to reduce overall comparison times for long words.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS85P

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

P

—

HD74LS85FPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

Note:

Please consult the sales office for the above package availability.

Pin Arrangement

(Top view)

GND

15

16

1

2

3

4

5

6

7

14

8

9

10

11

12

13

A<B

A<B

A=B

A>B

A=B

Data Input

A<B

A=B

A>B

A>B

A=B

A<B

A>B

Data Inputs

Cascade

Inputs

In

Out

Outputs