74ALS646 데이터 시트보기 (PDF) - Philips Electronics

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74ALS646

Transceiver/register

Philips Electronics 

Philips Semiconductors

Transceiver/register

Product specification

74ALS646/74ALS646-1

74ALS648/74ALS648-1

TEST CIRCUIT AND WAVEFORMS

VCC

VIN

VOUT

RL

PULSE

D.U.T.

GENERATOR

7.0V

90%

NEGATIVE

PULSE

tw

VM

10%

tTHL (tff)

VM

10%

tTLH (tr )

90%

AMP (V)

0.3V

RT

CL RL

Test Circuit for 3-State and Open Collector Outputs

SWITCH POSITION

TEST

tPLZ, tPZL

open collector

SWITCH

closed

closed

All other

open

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.

POSITIVE

PULSE

10%

tTLH (tr )

90%

VM

tw

tTHL (tf )

90%

VM

AMP (V)

10%

0.3V

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

SC00126

1991 Feb 08

10

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