74F641 datasheet(7/10 Pages) PHILIPS

7 / 10 page

Philips Semiconductors

Product specification

74F641/74F642*

Transceivers

1999 Jan 08

* Discontinued part. Please see the Discontinued Products List.

AC WAVEFORMS (Continued)

For all waveforms, VM = 1.5V.

An or Bn

tPLH

tPHL

SF01151

Waveform 3. Propagation Delay for OE to An or Bn Outputs

(74F642) (Bn or An Inputs in High State)

An or Bn

tPLH

tPHL

SF01151

Waveform 4. Propagation Delay for OE to An or Bn Outputs

(74F641) (Bn or An Inputs in Low State)

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 3-State 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

SF00777

TEST

SWITCH

tPLZ

closed

tPZL

closed

All other

open

SWITCH POSITION

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