74F85 datasheet(6/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F85

4-bit magnitude comparator

September 27, 1994

AC ELECTRICAL CHARACTERISTICS

LIMITS

TEST

VCC = +5.0V

VCC = +5.0V ± 10%

SYMBOL

PARAMETER

TEST

CONDITION

Tamb = +25°C

Tamb = 0°C to +70°C

UNIT

CONDITION

CL = 50pF, RL = 500Ω

MIN

TYP

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

A or B to A<B, A>B

Waveform 1

3 logic levels

6.0

7.0

8.5

9.5

11.0

14.0

5.5

6.5

13.0

15.5

tPLH

tPHL

Propagation delay

A or B to A=B

Waveform 1

4 logic levels

6.5

7.0

9.0

9.5

11.5

14.0

6.0

6.5

14.0

14.5

tPLH

tPHL

Propagation delay

IA<B and IA=B to A>B

Waveform 1

1 logic level

3.0

5.0

6.0

7.5

9.0

2.5

9.0

10.0

tPLH

tPHL

Propagation delay

IA=B to A=B

Waveform 1

2 logic levels

2.5

3.5

4.5

7.5

7.0

10.0

2.0

2.5

9.0

12.0

tPLH

tPHL

Propagation delay

IA>B and IA=B to A<B

Waveform 1

1 logic level

3.0

5.0

6.0

8.0

9.0

3.0

2.0

9.5

AC WAVEFORMS

VOUT

VIN

tPHL

tPLH

SF00080

Waveform 1.

Propagation Delay Input to Output

NOTE:

For all waveforms, VM = 1.5V.

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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