74ALS253 datasheet(5/9 Pages) PHILIPS

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Philips Semiconductors

Product specification

74ALS253

Dual 4-input multiplexer (3-State)

1991 Feb 08

AC WAVEFORMS

For all waveforms, VM = 1.3V.

In, Sn

tPLH

tPHL

SF00802

Waveform 1.

Propagation Delay for Data and Select to Output

tPHZ

tPZH

VOH –0.3V

OEn

SF00804

Waveform 2.

3-State Output Enable Time to High Level

and Output Disable Time from High Level

tPLZ

tPZL

VOL +0.3V

OEn

SC00075

3.5V

Waveform 3.

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)

0.3V

tTHL (tff)

INPUT PULSE REQUIREMENTS

Rep.Rate

tTLH

tTHL

1MHz

500ns

2.0ns

Input Pulse Definition

VCC

Family

74ALS

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

3.5V

1.3V

SC00072

7.0V

SWITCH POSITION

TEST

SWITCH

tPLZ, tPZL

closed

All other

open

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