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MC74VHCT240AM

Octal Bus Buffer/Line Driver Inverting with 3-State Outputs

ON Semiconductor 

ON Semiconductort

Octal Bus Buffer/Line Driver

Inverting with 3-State Outputs

The MC74VHCT240A 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 MC74VHCT240A is an inverting 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 VHCT240A 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: 110 FETs or 27.5 Equivalent Gates

A1 2

18 YA1

A2 4

A3 6

DATA

INPUTS

A4 8

B1 11

B2 13

16 YA2

14 YA3

12 YA4

INVERTING

9 YB1 OUTPUTS

7 YB2

B3 15

5 YB3

B4 17

3 YB4

OUTPUT

ENABLES

OEA 1

OEB 19

Figure 1. Logic Diagram

© Semiconductor Components Industries, LLC, 2001

1

March, 2001 – Rev. 3

MC74VHCT240A

DW SUFFIX

20–LEAD SOIC WIDE PACKAGE

CASE 751D–05

DT SUFFIX

20–LEAD TSSOP PACKAGE

CASE 948E–02

M SUFFIX

20–LEAD SOIC EIAJ PACKAGE

CASE 967–01

ORDERING INFORMATION

MC74VHCTXXXADW SOIC WIDE

MC74VHCTXXXADT TSSOP

MC74VHCTXXXAM SOIC EIAJ

FUNCTION TABLE

INPUTS

OUTPUTS

OEA, OEB

A, B

YA, YB

L

L

H

L

H

L

H

X

Z

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

Figure 2. Pin Assignment

Publication Order Number:

MC74VHCT240A/D

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