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PDF MC74HCT138A Data sheet ( Hoja de datos )
| Número de pieza | MC74HCT138A | |
| Descripción | 1-of-8 Decoder/ Demultiplexer | |
| Fabricantes | ON Semiconductor | |
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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
• Output Drive Capability: 10 LSTTL Loads
• TTL/NMOS Compatible Input Levels
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 to 6 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
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
LOGIC DIAGRAM
ADDRESS
INPUTS
A0 1
A1 2
A2 3
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10
Y5
9 Y6
7
Y7
ACTIVE-LOW
OUTPUTS
CHIP-
CS1 6
SELECT CS2 4
INPUTS CS3 5
PIN 16 = VCC
PIN 8 = GND
www.onsemi.com
SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
PIN ASSIGNMENT
A0
A1
A2
CS2
CS3
CS1
Y7
GND
1
2
3
4
5
6
7
8
16 VCC
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10 Y5
9 Y6
MARKING DIAGRAMS
16
HCT138AG
AWLYWW
1
SOIC−16
16
HCT
138A
ALYWG
G
1
TSSOP−16
A
WL, L
YY, Y
WW, W
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 5 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
June, 2015 − Rev. 11
1
Publication Order Number:
MC74HCT138A/D
1 page  
MC74HCT138A
TEST CIRCUIT
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
CL*
*Includes all probe and jig capacitance
Figure 4.
ORDERING INFORMATION
Device
Package
Shipping†
MC74HCT138ADG
SOIC−16
(Pb−Free)
48 Units / Rail
MC74HCT138ADR2G
SOIC−16
(Pb−Free)
2500 Units / Tape & Reel
MC74HCT138ADTR2G
TSSOP−16
(Pb−Free)
2500 Units / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
www.onsemi.com
5
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