74F244 datasheet(7/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F244/74F244B

Octal buffers (3-State)

1994 Dec 5

AC WAVEFORMS

For all waveforms, VM = 1.5V.

Ian, Ibn

tPLH

tPHL

SF00231

Waveform 1. Propagation Delay for data to outputs

VOH–0.3V

tPZH

tPHZ

SF00233

OEn

Waveform 2. 3-State output enable time to high level

and output disable time from high level

Yn, Yn

tsk(0)

SF00232

Yn, Yn

Waveform 3. Output skew

VOL+0.3V

tPZL

tPLZ

SF00234

OEn

3.5V

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

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

SWITCH POSITION

TEST

SWITCH

closed

open

All other

tPLZ, tPZL

SF000235

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