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74F251A

8-input multiplexer (3-State)

Philips Electronics 

Philips Semiconductors

8-input multiplexer (3-State)

Product specification

74F251A

TEST CIRCUIT AND WAVEFORMS

VCC

VIN

PULSE

GENERATOR

VOUT

RL

D.U.T.

RT

CL RL

Test Circuit for 3-State Outputs

SWITCH POSITION

TEST

tPLZ

tPZL

All other

SWITCH

closed

closed

open

7.0V

90%

NEGATIVE

PULSE

POSITIVE

PULSE

10%

tw

VM

10%

tTHL (tf )

VM

10%

tTLH (tr )

tTLH (tr )

90%

VM

tw

tTHL (tf )

90%

VM

Input Pulse Definition

90%

AMP (V)

0V

AMP (V)

10%

0V

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.

INPUT PULSE REQUIREMENTS

family

amplitude VM rep. rate

tw

tTLH

74F

3.0V 1.5V 1MHz 500ns 2.5ns

tTHL

2.5ns

SF00777

1996 Jan 05

5

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