74F138 datasheet(5/8 Pages) PHILIPS

5 / 8 page

Philips Semiconductors

Product specification

74F138

1-of-8 decoder/demultiplexer

February 14, 1991

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

VCC = +5.0V ± 10%

Tamb = –40°C to +85°C

CL = 50pF

RL = 500Ω

UNIT

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

An to Qn

Waveform 1, 2

3.5

4.0

5.6

6.1

7.0

8.0

3.5

4.0

8.0

9.0

3.0

3.5

8.5

9.0

tPLH

tPHL

Propagation delay

E0 or E1 to Qn

Waveform 2

3.5

3.0

6.4

5.3

7.0

3.5

3.0

8.0

7.5

3.0

8.0

7.5

tPLH

tPHL

Propagation delay

E2 to Qn

Waveform 1

4.0

3.5

6.2

5.6

8.0

7.5

4.0

3.5

9.0

8.5

4.0

3.5

9.5

8.5

AC WAVEFORMS

For all waveforms, VM = 1.5V

An, E2

tPHL

tPLH

SF00179

Waveform 1.

Propagation Delay for Inverting Outputs

An, E0, E1

tPHL

tPLH

SF00180

Waveform 2.

Propagation Delay 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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