74ALS157 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

比赛名单

74ALS157

Data selector/multiplexer

Philips Electronics 

Philips Semiconductors

Data selector/multiplexer

Product specification

74ALS157/74ALS158

TEST CIRCUIT AND WAVEFORMS

VIN

PULSE

GENERATOR

VCC

VOUT

D.U.T.

90%

NEGATIVE

PULSE

tw

VM

10%

tTHL (tff)

VM

10%

tTLH (tr )

90%

AMP (V)

0.3V

RT

CL RL

Test Circuit for Totem-pole Outputs

POSITIVE

PULSE

10%

tTLH (tr )

90%

VM

tw

tTHL (tf )

90%

VM

AMP (V)

10%

0.3V

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.

Input Pulse Definition

INPUT PULSE REQUIREMENTS

Family

Amplitude VM Rep.Rate tw tTLH

74ALS 3.5V 1.3V 1MHz 500ns 2.0ns

tTHL

2.0ns

SC00005

1991 Feb 08

6

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