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MC74VHCT244AN

Octal Bus Buffer/Line Driver with 3−State Outputs

ON Semiconductor 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Octal Bus Buffer/Line Driver

with 3-State Outputs

The MC74VHCT244A is an advanced high speed CMOS octal bus buffer

fabricated with silicon gate CMOS technology. It achieves high speed

operation similar to equivalent Bipolar Schottky TTL while maintaining

CMOS low power dissipation.

The MC74VHCT244A is a noninverting 3–state buffer, and has two

active–low output enables. This device is designed to be used with 3–state

memory address drivers, etc.

The VHCT inputs are compatible with TTL levels. This device can be used

as a level converter for interfacing 3.3V to 5.0V, because it has full 5V CMOS

level output swings.

The VHCT244A input and output (when disabled) structures provide

protection when voltages between 0V and 5.5V are applied, regardless of

the supply voltage. These input and output structures help prevent device

destruction caused by supply voltage – input/output voltage mismatch,

battery backup, hot insertion, etc.

• High Speed: tPD = 5.6ns (Typ) at VCC = 5V

• Low Power Dissipation: ICC = 4µA (Max) at TA = 25°C

• TTL–Compatible Inputs: VIL = 0.8V; VIH = 2.0V

• Power Down Protection Provided on Inputs and Outputs

• Balanced Propagation Delays

• Designed for 4.5V to 5.5V Operating Range

• Low Noise: VOLP = 1.1V (Max)

• Pin and Function Compatible with Other Standard Logic Families

• Latchup Performance Exceeds 300mA

• ESD Performance: HBM > 2000V; Machine Model > 200V

• Chip Complexity: 112 FETs or 28 Equivalent Gates

A1 2

A2 4

A3 6

DATA

INPUTS

A4 8

B1 11

B2 13

B3 15

B4 17

LOGIC DIAGRAM

18 YA1

16 YA2

14 YA3

12 YA4

NONINVERTING

9 YB1 OUTPUTS

7 YB2

5 YB3

3 YB4

OUTPUT OEA 1

ENABLES OEB 19

MC74VHCT244A

DW SUFFIX

20–LEAD SOIC PACKAGE

CASE 751D–04

DT SUFFIX

20–LEAD TSSOP PACKAGE

CASE 948E–02

M SUFFIX

20–LEAD SOIC EIAJ PACKAGE

CASE 967–01

ORDERING INFORMATION

MC74VHCTXXXADW SOIC

MC74VHCTXXXADT TSSOP

MC74VHCTXXXAM

SOIC EIAJ

PIN ASSIGNMENT

OEA 1

A1 2

YB4 3

A2 4

YB3 5

A3 6

YB2 7

A4 8

YB1 9

GND 10

20 VCC

19 OEB

18 YA1

17 B4

16 YA2

15 B3

14 YA3

13 B2

12 YA4

11 B1

FUNCTION TABLE

INPUTS

OEA, OEB

A, B

L

L

L

H

H

X

OUTPUTS

YA, YB

L

H

Z

6/97

© Motorola, Inc. 1997

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