74F241 datasheet(8/12 Pages) PHILIPS

8 / 12 page

Philips Semiconductors

Product specification

74F240/74F240A/

74F241/74F241A

Buffers

January 2, 1991

tPHZ

tPZH

VOH -0.3V

Yn, Yn

OEn

OEb

SF00330

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

and output disable time from high level

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

tsk(0)

Yn, Yn

SF00332

Waveform 5. Output skew

Notes to AC waveforms

1. For all waveforms, VM = 1.5V.

2. The shaded areas indicate when the input is permitted to change

for predictable output performance.

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 Open Collector 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

SF00128

TEST

SWITCH

tPLZ

closed

tPZL

closed

All other

open

SWITCH POSITION

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