Philips Semiconductors

Product specification

74F655A*

74F656A

Buffers/drivers

1991 Jul 17

8

* Discontinued part. Please see the Discontinued Products List.

AC WAVEFORMS

SF00965

VM

VM

VM

VM

tPHL

tPLH

Dn

SE, SO, Qn

Waveform 1. Propagation Delay, Non-Inverting Outputs

SF00966

VM

VM

VM

VM

tPHL

tPLH

Dn

SE, SO, Qn

Waveform 2. Propagation Delay, Inverting Outputs

VM

VM

VM

tPHZ

tPZH

VOH -0.3V

0V

OEn

SF00967

SE, SO, Qn, Qn

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

and Output Disable Time from High Level

VM

VM

VM

tPLZ

tPZL

VOL +0.3V

OEn

SF00968

SE, SO, Qn, Qn

Waveform 4. 3-State Output Enable Time to Low Level

and Output Disable Time from Low Level

TEST CIRCUIT AND WAVEFORM

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 3-State 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

SF00777

TEST

SWITCH

closed

closed

All other

open

SWITCH POSITION