MC74HC85DT View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC74HC85DT

4-Bit Magnitude Comparator

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

4-Bit Magnitude Comparator

High–Performance Silicon–Gate CMOS

The MC74HC85 is identical in pinout and function to the LS85. This device

is similar in function to the MM74C85 and L85, but has a different pinout. The

device inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LSTTL outputs.

This 4–Bit Magnitude Comparator compares two 4–bit nibbles and gives a

high voltage level on either the A > Bout, A = Bout, or A < Bout output, leaving

the other two at a low voltage level. This device also has A > Bin, A = Bin, and

A < Bin inputs, eliminating the need for external gates when cascading.

• Output Drive Capability: 10 LSTTL Loads

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2 to 6 V

• Low Input Current: 1 µA

• High Noise Immunity Characteristic of CMOS Devices

• In Compliance with the Requirements Defined by JEDEC Standard

No. 7A

• Chip Complexity: 248 FETs or 62 Equivalent Gates

LOGIC DIAGRAM

DATA

INPUTS

A0 10

A1 12

A2 13

A3 15

B0 9

B1 11

B2 14

B3 1

CASCADING

INPUTS

A > Bin 4

A = Bin 3

A < Bin 2

5 A > Bout

6 A = Bout

7 A < Bout

COMPARISON

OUTPUTS

PIN 16 = VCC

PIN 8 = GND

MC74HC85

16

1

16

1

N SUFFIX

PLASTIC PACKAGE

CASE 648–08

DT SUFFIX

TSSOP PACKAGE

CASE 948F–01

ORDERING INFORMATION

MC74HCXXN

MC74HCXXDT

Plastic

TSSOP

PIN ASSIGNMENT

B3 1

tA Bin 2

A = Bin 3

uA Bin 4

uA Bout 5

A = Bout 6

tA Bout 7

GND 8

16 VCC

15 A3

14 B2

13 A2

12 A1

11 B1

10 A0

9 B0

10/95

© Motorola, Inc. 1995

1

REV 6

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