N74F251AN datasheet(5/5 Pages) PHILIPS

Part #	N74F251AN

Description	8-input multiplexer 3-State

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

Product specification

74F251A

8-input multiplexer (3-State)

1996 Jan 05

5

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

tTHL (tf )

INPUT PULSE REQUIREMENTS

rep. rate

tw

tTLH

tTHL

1MHz

500ns

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:

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

VM

RL

7.0V

SF00777

TEST

SWITCH

tPLZ

closed

tPZL

closed

All other

open

SWITCH POSITION

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