74LVC245A datasheet(2/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC245A

74LVCH245A

Octal bus transceiver with direction pin with

5-volt tolerant inputs/outputs (3-State)

1998 May 20

853-2044 19419

FEATURES

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

• Supply voltage range of 2.7V 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

• Bushold on all data inputs (74LVCH245A only)

DESCRIPTION

The 74LVC245A/74LVCH245A 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 74LVC245A/74LVCH245A is an octal transceiver featuring

non-inverting 3-State bus compatible outputs in both send and

receive directions. The ’245’ features an output enable (OE) input for

easy cascading and a send/receive (DIR) input for direction control.

OE controls the outputs so that the buses are effectively isolated.

The ’245’ is functionally identical to the ’640’, but the ’640’ has true

(non-inverting) outputs.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

tPHL/tPLH

Propagation delay

An to Bn;

Bn to An

CL = 50pF

VCC = 3.3V

3.6

Input capacitance

5.0

CI/O

Input/output capacitance

10.0

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 Shrink Small Outline (SO)

–40

°C to +85°C

74LVC245A D

SOT163-1

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

–40

°C to +85°C

74LVC245A DB

SOT339-1

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

–40

°C to +85°C

74LVC245A PW

7LVC245APW DH

SOT360-1

20-Pin Plastic Shrink Small Outline (SO)

–40

°C to +85°C

74LVCH245A D

SOT163-1

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

–40

°C to +85°C

74LVCH245A DB

SOT339-1

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

–40

°C to +85°C

74LVCH245A PW

LVCH245APW DH

SOT360-1

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