MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 7

2/97

Octal 3-State Noninverting

Buffer/Line Driver/

Line Receiver

High–Performance Silicon–Gate CMOS

The MC54/74HC244A is identical in pinout to the LS244. The device

inputs are compatible with standard CMOS outputs; with pullup resistors,

they are compatible with LSTTL outputs.

This octal noninverting buffer/line driver/line receiver is designed to be

used with 3–state memory address drivers, clock drivers, and other

bus–oriented systems. The device has noninverting outputs and two

active–low output enables.

The HC244A is similar in function to the HC240A and HC241A.

• Output Drive Capability: 15 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: 136 FETs or 34 Equivalent Gates

LOGIC DIAGRAM

DATA

INPUTS

A1

A2

A3

A4

B1

B2

B3

B4

17

15

13

11

8

6

4

218

16

14

12

9

7

5

3

YB4

YB3

YB2

YB1

YA4

YA3

YA2

YA1

NONINVERTING

OUTPUTS

PIN 20 = VCC

PIN 10 = GND

OUTPUT

ENABLES

ENABLE A

ENABLE B

1

19

MC54/74HC244A

PIN ASSIGNMENT

A3

A2

YB4

A1

ENABLE A

GND

YB1

A4

YB2

YB3

5

4

3

2

1

10

9

8

7

6

14

15

16

17

18

19

20

11

12

13

YA2

B4

YA1

ENABLE B

VCC

B1

YA4

B2

YA3

B3

FUNCTION TABLE

Inputs

Outputs

Enable A,

Enable B

A, B

YA, YB

LL

L

LH

H

HX

Z

Z = high impedance

DW SUFFIX

SOIC PACKAGE

CASE 751D–04

N SUFFIX

PLASTIC PACKAGE

CASE 738–03

ORDERING INFORMATION

MC54HCXXXAJ

MC74HCXXXAN

MC74HCXXXADW

MC74HCXXXASD

MC74HCXXXADT

Ceramic

Plastic

SOIC

SSOP

TSSOP

DT SUFFIX

TSSOP PACKAGE

CASE 948E–02

J SUFFIX

CERAMIC PACKAGE

CASE 732–03

1

20

1

20

SD SUFFIX

SSOP PACKAGE

CASE 940C–03

1

20

1

20

1

20