74F623 datasheet(8/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F620/74F623

Transceivers

1990 Apr 6

AC WAVEFORMS

For all waveforms, VM = 1.5V.

Bn or An

An or Bn

tPLH

tPHL

SF01131

Waveform 1. For Inverting Outputs

Bn or An

An or Bn

tPLH

tPHL

SF01132

Waveform 2. For Non-Inverting Outputs

tPHZ

tPZH

VOH -0.3V

SF01133

An or Bn

OEBA

OEAB

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

Output Disable Time from High Level

tPLZ

tPZL

VOL +0.3V

An or Bn

OEBA

SF01134

OEAB

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

Output Disable Time from Low 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 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

74F623 Datasheet(PDF) 8 Page - NXP Semiconductors

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