74F521 datasheet(5/8 Pages) PHILIPS

5 / 8 page

Philips Semiconductors

Product specification

74F521

8-bit identity comparator

May 15, 1990

AC ELECTRICAL CHARACTERISTICS

LIMITS

SYMBOL

PARAMETER

TEST

CONDITION

VCC = +5.0V

Tamb = +25°C

CL = 50pF, RL = 500Ω

VCC = +5.0V ± 10%

Tamb = 0°C to +70°C

CL = 50pF, RL = 500Ω

UNIT

MIN

TYP

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

An or Bn to QA=B

Waveform 1, 2

3.5

3.0

8.0

9.5

9.0

3.5

2.5

11.0

10.5

tPLH

tPHL

Propagation delay

IA=B to QA=B

Waveform 2

3.0

3.5

5.0

6.5

7.0

3.0

3.5

7.5

8.0

AC WAVEFORMS

For all waveforms, VM = 1.5V.

QA=B

An, Bn

tPHL

tPLH

SF00278

Waveform 1.

For Inverting Outputs

QA=B

An, Bn

tPLH

tPHL

SF00279

IA=B

Waveform 2.

For Non-Inverting Outputs

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 Totem-Pole 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

SF00006

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