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MC74HCT244AH

Octal 3−State Noninverting Buffer/Line Driver/Line Receiver with LSTTL−Compatible Inputs

ON Semiconductor 

MC74HCT244A

Octal 3-State Noninverting

Buffer/Line Driver/

Line Receiver with

LSTTL-Compatible Inputs

High–Performance Silicon–Gate CMOS

The MC74HCT244A is identical in pinout to the LS244. This

device may be used as a level converter for interfacing TTL or NMOS

outputs to High–Speed CMOS inputs. The HCT244A is an octal

noninverting buffer line driver line receiver designed to be used with

3–state memory address drivers, clock drivers, and other bus–oriented

systems. The device has non–inverted outputs and two active–low

output enables.

The HCT244A is the noninverting version of the HCT240. See also

HCT241.

• Output Drive Capability: 15 LSTTL Loads

• TTL NMOS–Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 1 µA

• In Compliance with the Requirements Defined by JEDEC Standard

No. 7A

• Chip Complexity: 112 FETs or 28 Equivalent Gates

LOGIC DIAGRAM

A1 2

18 YA1

A2 4

16 YA2

A3 6

14 YA3

A4 8

DATA INPUTS

B1 11

12 YA4

9 YB1

NONINVERTING

OUTPUTS

B2 13

7 YB2

B3 15

5 YB3

B4 17

3 YB4

http://onsemi.com

20

1

20

1

PDIP–20

N SUFFIX

CASE 738

SOIC WIDE–20

DW SUFFIX

CASE 751D

MARKING

DIAGRAMS

20

MC74HCT244AN

AWLYYWW

1

20

HCT244A

AWLYYWW

1 20

20

1

TSSOP–20

DT SUFFIX

CASE 948E

HCT

244A

ALYW

1

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

PIN ASSIGNMENT

ENABLE A 1

A1 2

YB4 3

A2 4

YB3 5

A3 6

YB2 7

A4 8

YB1 9

GND 10

20 VCC

19 ENABLE B

18 YA1

17 B4

16 YA2

15 B3

14 YA3

13 B2

12 YA4

11 B1

OUTPUT ENABLE A 1

ENABLES ENABLE B 19

PIN 20 = VCC

PIN 10 = GND

FUNCTION TABLE

Inputs

Outputs

Enable A,

Enable B A, B YA, YB

L

L

L

L

H

H

H

X

Z

Z = high impedance, X = don’t care

ORDERING INFORMATION

Device

Package Shipping

MC74HCT244AN

PDIP–20 1440 / Box

MC74HCT244ADW SOIC–WIDE 38 / Rail

MC74HCT244ADWR2 SOIC–WIDE 1000 / Reel

MC74HCT244ADT

TSSOP–20 75 / Rail

MC74HCT244ADTR2 TSSOP–20 2500 / Reel

© Semiconductor Components Industries, LLC, 2000

1

May, 2000 – Rev. 9

Publication Order Number:

MC74HCT244A/D

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