MM54HC85 datasheet(1/6 Pages) NSC

No de pièce	MM54HC85

Description	4-Bit Magnitude Comparator

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Fabricant	NSC [National Semiconductor (TI)]

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TLF5205

November 1995

MM54HC85MM74HC85

4-Bit Magnitude Comparator

General Description

The MM54HC85MM74HC85 is a 4-bit magnitude compara-

tor that utilizes advanced silicon-gate CMOS technology It

is designed for high speed comparison of two four bit words

This circuit has eight comparison inputs 4 for each word

three cascade inputs (AkB AlB AeB) and three deci-

sion outputs (AkB AlB AeB) 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 con-

necting the outputs of the least significant stage to the cas-

cade 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 AeB input and a low

level to the AkB and AlB inputs

The comparator’s outputs can drive 10 low power Schottky

TTL (LS-TTL) equivalent loads and is functionally and pin

equivalent to the 54LS8574LS85 All inputs are protected

from damage due to static discharge by diodes to VCC and

ground

Features

Y

Typical propagation delay 27 ns

Y

Wide operating voltage range 2 – 6V

Y

Low input current 1 mA maximum

Y

Low quiescent current 80 mA maximum (74HC Series)

Y

Output drive capability 10 LS-TTL loads

Connection Diagram

Dual-In-Line Package

TLF5205 – 1

Order Number MM54HC85 or MM74HC85

Truth Table

Comparing

Cascading

Outputs

Inputs

A3 B3

A2 B2

A1 B1

A0 B0

A l BA k BA e BA l BA k BA e B

A3 l B3

X

H

L

A3 k B3

X

L

H

L

A3 e B3

A2 l B2

X

H

L

A3 e B3

A2 k B2

X

L

H

L

A3 e B3

A2 e B2

A1 l B1

X

H

L

A3 e B3

A2 e B2

A1 k B1

X

L

H

L

A3 e B3

A2 e B2

A1 e B1

A0 l B0

X

H

L

A3 e B3

A2 e B2

A1 e B1

A0 k B0

X

L

H

L

A3 e B3

A2 e B2

A1 e B1

A0 e B0

H

L

H

L

A3 e B3

A2 e B2

A1 e B1

A0 e B0

L

H

L

H

L

A3 e B3

A2 e B2

A1 e B1

A0 e B0

X

HL

LH

A3 e B3

A2 e B2

A1 e B1

A0 e B0

H

LL

A3 e B3

A2 e B2

A1 e B1

A0 e B0

L

LH

HL

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A

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