74ALS139 datasheet(5/8 Pages) PHILIPS

Il numero della parte	74ALS139

Spiegazioni elettronici	Dual 1-of-4 decoder/demultiplexer

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Produttore elettronici	PHILIPS [NXP Semiconductors]

Homepage	http://www.nxp.com

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Philips Semiconductors

Product specification

74ALS139

Dual 1-of-4 decoder/demultiplexer

1991 Feb 08

5

TEST CIRCUIT AND WAVEFORMS

tw

90%

VM

10%

90%

VM

10%

90%

VM

10%

90%

VM

10%

NEGATIVE

PULSE

POSITIVE

PULSE

tw

AMP (V)

0.3V

tTHL (tff)

INPUT PULSE REQUIREMENTS

Rep.Rate

tw

tTLH

tTHL

1MHz

500ns

2.0ns

Input Pulse Definition

VCC

Family

74ALS

D.U.T.

PULSE

GENERATOR

RL

CL

RT

VIN

VOUT

Test Circuit for Totem-pole Outputs

DEFINITIONS:

RL = Load resistor;

see AC electrical characteristics for value.

CL = Load capacitance includes jig and probe capacitance;

see AC electrical characteristics for value.

RT = Termination resistance should be equal to ZOUT of

pulse generators.

tTHL (tf )

tTLH (tr )

AMP (V)

Amplitude

3.5V

1.3V

VM

SC00005

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