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N74F85N

4-bit magnitude comparator

Philips Electronics 

Philips Semiconductors

4-bit magnitude comparator

Product specification

74F85

AC ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

tPLH

Propagation delay

tPHL

A or B to A<B, A>B

tPLH

Propagation delay

tPHL

A or B to A=B

tPLH

Propagation delay

tPHL

IA<B and IA=B to A>B

tPLH

Propagation delay

tPHL

IA=B to A=B

tPLH

Propagation delay

tPHL

IA>B and IA=B to A<B

AC WAVEFORMS

TEST

CONDITION

Waveform 1

3 logic levels

Waveform 1

4 logic levels

Waveform 1

1 logic level

Waveform 1

2 logic levels

Waveform 1

1 logic level

LIMITS

VCC = +5.0V

Tamb = +25°C

CL = 50pF, RL = 500Ω

VCC = +5.0V ± 10%

Tamb = 0°C to +70°C

CL = 50pF, RL = 500Ω

MIN

TYP MAX

MIN

MAX

6.0

8.5

11.0

5.5

13.0

7.0

9.5

14.0

6.5

15.5

6.5

9.0

11.5

6.0

14.0

7.0

9.5

14.0

6.5

14.5

3.0

5.0

7.5

2.5

9.0

3.0

6.0

9.0

2.5

10.0

2.5

4.5

7.0

2.0

9.0

3.5

7.5

10.0

2.5

12.0

3.0

5.0

8.0

3.0

9.5

3.0

6.0

9.0

2.0

9.5

UNIT

ns

ns

ns

ns

ns

VIN

VOUT

VM

tPHL

VM

tPLH

VM

VM

SF00080

Waveform 1. Propagation Delay Input to Output

NOTE:

For all waveforms, VM = 1.5V.

TEST CIRCUIT AND WAVEFORMS

VIN

PULSE

GENERATOR

VCC

VOUT

D.U.T.

NEGATIVE

PULSE

90%

tw

VM

10%

tTHL (tf )

VM

10%

tTLH (tr )

90%

AMP (V)

0V

RT

CL RL

Test Circuit for Totem-Pole Outputs

POSITIVE

PULSE

10%

tTLH (tr )

90%

VM

tw

tTHL (tf )

90%

VM

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 Definition

family

74F

INPUT PULSE REQUIREMENTS

amplitude VM rep. rate

tw

tTLH

3.0V 1.5V 1MHz 500ns 2.5ns

tTHL

2.5ns

SF00006

September 27, 1994

6

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