74LVC240 Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

производитель

74LVC240

Octal buffer/line driver with 5 V tolerant inputs/outputs; inverting(3-state)

Philips Electronics 

Philips Semiconductors

Octal buffer/line driver with 5 V tolerant

inputs/outputs; inverting (3-state)

Product specification

74LVC240A

FEATURES

• 5 V tolerant inputs/outputs, for interfacing with 5 V logic

• Supply voltage range from 1.2 to 3.6 V

• Complies with JEDEC standard no. 8-1A

• CMOS low power consumption

• Direct interface with TTL levels

• High-impedance when VCC = 0 V.

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 3.3 or 5 V devices.

In 3-state operation, outputs can handle 5 V. These

features allow the use of these devices as translators in a

mixed 3.3 and 5 V environment.

The 74LVC240A 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 74LVC240A is functionally identical to the

74LVC244A, which has non-inverting outputs.

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf ≤ 2.5 ns.

SYMBOL

tPHL/tPLH

CI

CPD

PARAMETER

propagation delay nAn to nYn

input capacitance

power dissipation capacitance per buffer

CONDITIONS

CL = 50 pF; VCC = 3.3 V

notes 1 and 2

Notes

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

PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in Volts;

∑ (CL × VCC2 × fo) = sum of outputs.

2. The condition is VI = GND to VCC.

TYPICAL

3.5

5.0

20

UNIT

ns

pF

pF

2002 Oct 02

2

Share Link: