IN74ACT138 Просмотр технического описания (PDF) - Integral Corp.

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IN74ACT138

1-OF-8 DECODER/DEMULTIPLEXER

Integral Corp. 

IN74ACT138

1-OF-8 DECODER/DEMULTIPLEXER

High-Speed Silicon-Gate CMOS

The IN74ACT138 is identical in pinout to the LS/ALS138,

HC/HCT138. The IN74ACT138 may be used as a level converter

for interfacing TTL or NMOS outputs to High Speed CMOS inputs.

The IN74ACT138 decodes a three-bit Address to one-of-eight

active-lot outputs. This device features three Chip Select inputs,

two active-low and one active-high to facilitate the demultiplexing,

cascading, and chip-selecting functions. The demultiplexing

function is accomplished by using the Address inputs to select the

desired device output; one of the Chip Selects is used as a data

input while the other Chip Selects are held in their active states.

• TTL/NMOS Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 1.0 µA; 0.1 µA @ 25°C

• Outputs Source/Sink 24 mA

ORDERING INFORMATION

IN74ACT138N Plastic

IN74ACT138D SOIC

TA = -40° to 85° C for all

packages

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 16 =VCC

PIN 8 = GND

FUNCTION TABLE

Inputs

Outputs

CS1CS2CS3 A2 A1A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

XXH

XXX H H H H H H H H

XHX

XXX H H H H H H H H

LXX

XXX H H H H H H H H

HLL

LLL L H H H H H H H

HLL

LLH H L H H H H H H

HLL

LHL H H L H H H H H

HLL

LHH H H H L H H H H

HLL

HLL H H H H L H H H

HLL

HLH H H H H H L H H

HLL

HHL H H H H H H L H

HLL

HHH H H H H H H H L

H = high level (steady state)

L = low level (steady state)

X = don’t care

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