74AHC138 データシートの表示（PDF） - Philips Electronics

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74AHC138

3-to-8 line decoder/demultiplexer; inverting

Philips Electronics 

Philips Semiconductors

3-to-8 line decoder/demultiplexer; inverting

AC WAVEFORMS

Product specification

74AHC138;

74AHCT138

handbook, halfpageVCC

An, E3

INPUT

GND

tPHL

VOH

Yn

VOL

VM(1)

VM(1)

tPLH

MNA373

handbook, halfpageVCC

E1, E2

INPUT

GND

tPHL

VOH

Yn

VOL

VM(1)

VM(1)

tPLH

MNA374

FAMILY

VI INPUT

REQUIREMENTS

VM(1)

INPUT

VM(1)

OUTPUT

AHC

AHCT

GND to VCC

GND to 3.0 V

50% VCC 50% VCC

1.5 V

50% VCC

Fig.5 The address input (An) and enable input

(E3) to output (Yn) propagation delays.

FAMILY

VI INPUT

REQUIREMENTS

VM(1)

INPUT

VM(1)

OUTPUT

AHC

AHCT

GND to VCC

GND to 3.0 V

50% VCC 50% VCC

1.5 V

50% VCC

Fig.6 The enable input (E1, E2) to output (Yn)

propagation delays.

handbook, full pagewidth

PULSE

VI

GENERATOR

VCC

VO

D.U.T.

RT

S1

1000 Ω

VCC

open

GND

CL

MNA219

TEST

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

S1

open

VCC

GND

1999 Sep 27

Fig.7 Load circuitry for switching times.

10

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