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MC74VHCT540A

Octal Bus Buffer Inverting

ON Semiconductor 

MC74VHCT540A

Octal Bus Buffer

Inverting

The MC74VHCT540A is an advanced high speed CMOS inverting

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 MC74VHCT540A features inputs and outputs on opposite

sides of the package and two AND−ed active−low output enables.

When either OE1 or OE2 are high, the terminal outputs are in the

high impedance state.

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

be used as a level converter for interfacing 3.3 V to 5.0 V, because it

has full 5.0 V CMOS level output swings.

The VHCT540A input and output (when disabled) structures

provide protection when voltages between 0 V and 5.5 V 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.

The internal circuit is composed of three stages, including a buffer

output which provides high noise immunity and stable output. The

inputs tolerate voltages up to 7.0 V, allowing the interface of 5.0 V

systems to 3.0 V systems.

Features

• High Speed: tPD = 3.7 ns (Typ) at VCC = 5.0 V

• Low Power Dissipation: ICC = 4.0 μA (Max) at TA = 25°C

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

• Power Down Protection Provided on Inputs

• Balanced Propagation Delays

• Designed for 2.0 V to 5.5 V Operating Range

• Low Noise: VOLP = 1.2 V (Max)

• Pin and Function Compatible with Other Standard Logic Families

• Latchup Performance Exceeds 300 mA

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

• Chip Complexity: 124 FETs or 31 Equivalent Gates

w These devices are available in Pb−free package(s). Specifications herein

apply to both standard and Pb−free devices. Please see our website at

www.onsemi.com for specific Pb−free orderable part numbers, or contact

your local ON Semiconductor sales office or representative.

http://onsemi.com

MARKING

DIAGRAMS

20

1

SOIC

DW SUFFIX

CASE 751D

VHCT540A

AWLYYWW

20

1

TSSOP

DT SUFFIX

CASE 948E

VHCT

540A

ALYW

20

1

SOIC EIAJ

M SUFFIX

CASE 967

74VHCT540

AWLYWW

A

= Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

FUNCTION TABLE

Inputs

OE1 OE2

A

Output Y

L

L

L

H

L

L

H

L

H

X

X

Z

X

H

X

Z

ORDERING INFORMATION

Device

Package Shipping

MC74VHCT540ADW SOIC

38 Units/Rail

MC74VHCT540ADT TSSOP 75 Units/Rail

MC74VHCT540AM

SOIC

50 Units/Rail

© Semiconductor Components Industries, LLC, 2006

1

March, 2006 − Rev. 4

Publication Order Number:

MC74VHCT540A/D

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