74LVC240APW datasheet(2/11 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC240A

Octal buffer/line driver with 5-volt

tolerant inputs/outputs; inverting (3-State)

1998 May 20

853-1981 19419

FEATURES

• 5-volt tolerant inputs/outputs, for interfacing with 5-volt logic

• Supply voltage range of 1.2V to 3.6V

• Complies with JEDEC standard no. 8-1A

• CMOS low power consumption

• Direct interface with TTL levels

• High impedance when V

CC = 0V

DESCRIPTION

The 74LVC240A is a high-performance, low-power, low-voltage,

Si-gate CMOS device, superior to most advanced CMOS

compatible TTL families.

Inputs can be driven from either 3.3V or 5V devices. In 3-State

operation, outputs can handle 5V. These features allow the use of

these devices as translators in a mixed 3.3V/5V environment.

The ‘240A is an octal non-inverting buffer/line driver with 3-State

outputs. The 3-State outputs are controlled by the output enable

inputs 1OE and 2OE. A HIGH on nOE causes the outputs to

assume a high impedance OFF-state. Schmitt-trigger action at all

inputs makes the circuit highly tolerant for slower input rise and fall

times.

The ’240’ is functionally identical to the ’244’, but the ’244’ has

inverting outputs.

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25°C; tr = tf v2.5 ns

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

tPHL/tPLH

Propagation delay

1An to 1Yn;

2An to 2Yn

CL = 50pF

VCC = 3.3V

3.5

Input capacitance

5.0

CPD

Power dissipation capacitance per

buffer

Notes 1 and 2

NOTE:

1. CPD is used to determine the dynamic power dissipation (PD in mW):

PD = CPD x VCC2 x fi + S (CL x VCC2 x fo) where:

fi = input frequency in MHz; CL = output load capacity in pF;

fo = output frequency in MHz; VCC = supply voltage in V;

S (CL x VCC2 x fo) = sum of outputs.

2. The condition is VI = GND to VCC

ORDERING INFORMATION

PACKAGES

TEMPERATURE

RANGE

OUTSIDE

NORTH AMERICA

PKG. DWG. #

20-Pin Plastic Small Outline (SO)

–40

°C to +85°C

74LVC240A D

SOT163-1

20-Pin Plastic Shrink Small Outline (SSOP) Type II

–40

°C to +85°C

74LVC240A DB

SOT339-1

20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I

–40

°C to +85°C

74LVC240A PW

7LVC240APW DH

SOT360-1

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