74F2953 datasheet(9/14 Pages) PHILIPS

9 / 14 page

Philips Semiconductors

Product specification

74F2952, 74F2953

Transceivers

1989 Sep 22

AC WAVEFORMS

For all waveforms, VM = 1.5V.

The shaded areas indicate when the input is permitted to change for predictable output.

tW(H)

CPBA

CPAB

An or Bn

1/fMAX

tW(L)

tPHL

tPLH

SF01161

Waveform 1.

Propagation Delay, Clock Input to Output,

Clock Pulse Width, and Maximum Clock Frequency

ts(H)

ts(L)

th(H)

CPAB,

CPBA

An, Bn

CEAB,

CEBA

SF01381

Waveform 2.

Data Setup and Hold Times

tPHZ

tPZH

VOH -0.3V

OEAB,

OEBA

An, Bn

SF01382

Waveform 3.

3-State Output Enable Time to High Level

and Output Disable Time from High Level

tPLZ

tPZL

VOL +0.3V

An, Bn

OEAB,

OEBA

SF01383

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

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

SF00777

TEST

SWITCH

tPLZ

closed

tPZL

closed

All other

open

SWITCH POSITION

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