N74F649N View Datasheet(PDF) - Philips Electronics

Part Name

Description

MFG CO.

N74F649N

Octal transceiver/register, non-inverting (open-collector)

Philips Electronics 

Philips Semiconductors

Octal transceivers/registers (open-collector)

Product specification

74F647/74F649

TEST CIRCUIT AND WAVEFORMS

VCC

VIN

PULSE

GENERATOR

VOUT

RL

D.U.T.

RT

CL RL

Test Circuit for Open Collector Outputs

SWITCH POSITION

TEST

Open Collector

All other

SWITCH

closed

open

7.0V

90%

NEGATIVE

PULSE

POSITIVE

PULSE

10%

tw

VM

10%

tTHL (tf )

VM

10%

tTLH (tr )

tTLH (tr )

90%

VM

tw

tTHL (tf )

90%

VM

Input Pulse Definition

90%

AMP (V)

0V

AMP (V)

10%

0V

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 REQUIREMENTS

family

amplitude VM rep. rate

tw

tTLH

74F

3.0V 1.5V 1MHz 500ns 2.5ns

tTHL

2.5ns

SF00195

1992 Feb 28

8

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