74F640 datasheet(7/11 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F640

Octal bus transceiver, inverting (3-State)

1989 Nov 27

AC WAVEFORMS

For all waveforms, VM = 1.5V.

An, Bn

Bn, An

tPHL

tPLH

SF00773

Waveform 1. Propagation Delay for Inverting Outputs

VOL+0.3V

An, Bn

tPZL

tPLZ

SF00204

Waveform 2. 3-State Output Enable Time to Low Level and

Output Disable Time from Low Level

VOH–0.3V

An, Bn

tPZH

tPHZ

SF00203

Waveform 3. 3-State Output Enable Time to High Level and

Output Disable Time from High Level

TEST CIRCUIT AND WAVEFORMS

90%

10%

90%

10%

90%

10%

90%

10%

NEGATIVE

PULSE

POSITIVE

PULSE

AMP (V)

tTHL (tf )

INPUT PULSE REQUIREMENTS

rep. rate

tTLH

tTHL

1MHz

500ns

2.5ns

Input Pulse Definition

VCC

family

74F

D.U.T.

PULSE

GENERATOR

VIN

VOUT

Test Circuit for Open Collector 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

3.0V

1.5V

7.0V

SF00128

TEST

SWITCH

tPLZ

closed

tPZL

closed

All other

open

SWITCH POSITION

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