Philips Semiconductors

Product specification

74F2240, 74F2241

Octal buffers

December 13, 1990

6

AC WAVEFORMS

Ian, Ibn

Yn

SF00328

Waveform 1. Propagation delay for inverting outputs

VM

VM

VM

tPHZ

tPZH

VOH -0.3V

0V

Yn, Yn

OEn

OEb

SF00330

Waveform 3. 3-state output enable time to high level and output

disable time from high level

Ian, Ibn

Yn

SF00329

Waveform 2. Propagation delay for non–inverting outputs

VM

VM

VM

tPLZ

tPZL

VOL +0.3V

3.5V

OEn

OEb

Yn, Yn

SF00331

Waveform 4. 3-state output enable time to low level and output

disable time from low level

NOTES:

The shaded areas indicate when the input is permitted to change for predictable output performance.

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