Philips Semiconductors

Product specification

74F640

Octal bus transceiver, inverting (3-State)

1989 Nov 27

7

AC WAVEFORMS

An, Bn

Bn, An

tPHL

VM

VM

VM

VM

tPLH

SF00773

Waveform 1. Propagation Delay for Inverting Outputs

VOL+0.3V

VM

VM

VM

An, Bn

tPZL

tPLZ

SF00204

OE

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

Output Disable Time from Low Level

VOH–0.3V

VM

VM

VM

An, Bn

tPZH

tPHZ

SF00203

OE

0V

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

Output Disable Time from High Level

TEST CIRCUIT AND WAVEFORMS

tw

90%

VM

10%

90%

VM

10%

90%

VM

10%

90%

VM

10%

NEGATIVE

PULSE

POSITIVE

PULSE

tw

AMP (V)

0V

0V

tTHL (tf )

INPUT PULSE REQUIREMENTS

rep. rate

1MHz

500ns

2.5ns

2.5ns

Input Pulse Definition

VCC

family

74F

D.U.T.

PULSE

GENERATOR

RL

CL

RT

VIN

VOUT

Test Circuit for Open Collector Outputs

DEFINITIONS:

see AC electrical characteristics for value.

see AC electrical characteristics for value.

pulse generators.

tTHL (tf )

tTLH (tr )

tTLH (tr )

AMP (V)

amplitude

3.0V

1.5V

RL

7.0V

SF00128

TEST

SWITCH

closed

closed

All other

open

SWITCH POSITION