MC74HCT138A
1−of−8 Decoder/
Demultiplexer with LSTTL
Compatible Inputs
High−Performance Silicon−Gate CMOS
http://onsemi.com
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
MARKING
DIAGRAMS
16
16
1
PDIP−16
N SUFFIX
CASE 648
MC74HCT138AN
AWLYYWWG
1
16
•
•
•
•
•
•
Output Drive Capability: 10 LSTTL Loads
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
mA
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
•
Chip Complexity: 122 FETs or 30.5 Equivalent Gates
•
Pb−Free Packages are Available*
16
1
SOIC−16
D SUFFIX
CASE 751B
1
HCT138AG
AWLYWW
16
16
1
TSSOP−16
DT SUFFIX
CASE 948F
1
A
WL, L
Y, YY
W, WW
G
=
=
=
=
=
Assembly Location
Wafer Lot
Year
Work Week
Pb−Free Package
HCT
138
ALYW
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2005
1
July, 2005 − Rev. 8
Publication Order Number:
MC74HCT138A/D
ONSEMI [ ON SEMICONDUCTOR ]
