© Semiconductor Components Industries, LLC, 2005

July, 2005 − Rev. 8

1

Publication Order Number:

MC74HCT138A/D

MC74HCT138A

1−of−8 Decoder/

Demultiplexer with LSTTL

Compatible Inputs

High−Performance Silicon−Gate CMOS

The MC74HCT138A is identical in pinout to the LS138. The

HCT138A may be used as a level converter for interfacing TTL or

NMOS outputs to High Speed CMOS inputs.

The HCT138A 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.

Features

No. 7A

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

http://onsemi.com

MARKING

DIAGRAMS

SOIC−16

D SUFFIX

CASE 751B

TSSOP−16

DT SUFFIX

CASE 948F

1

16

PDIP−16

N SUFFIX

CASE 648

1

16

1

16

1

16

MC74HCT138AN

AWLYYWWG

1

16

HCT138AG

AWLYWW

HCT

138

ALYW

1

16

A

= Assembly Location

WL, L

= Wafer Lot

Y, YY

= Year

W, WW

= Work Week

G

= Pb−Free Package

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION