General Description
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The S74HC138 decodes a three bit Address to one of eight active low outputs. This device has three Chip
Select input prots, two active−low and one active−high to enbale 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
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Designed for 2 to 6V V
CC
Operation
Provide 8mA current with V
CC
=4.5V
CMOS low power design
Schmitt trigger input port
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These Devices are Pb. Free, Halogen Free/BFR Free and are RoHS Compliant
Part No. and Package: SOP16 TSSOP16 Pin Configuration
Top view
S74HC138
1-of-8 Decoder/Demultiplexer
Order Informatiion
MODEL
PACKAGE
ORDERING NUMBER
S74HC138
SOP16
S74HC138SO16
PACKING OPTION
Tape and Reel
S74HC138
TSSOP16
S74HC138TS16
Tape and Reel
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
(and designs) are registered trademarks of SUM Semiconductor Corporation.
Copyright SUM Semiconductor Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
Pin Function
Pin No. Symbol Description
1 A0 Address input 0
2 A1 Address input1
3 A2 Address input 2
4 E1
Enable input 1（Active Low）
5 E2
Enable input 2（Active Low）
6 E3
Enable input 3（Active High）
7 Y7 Output 7
8 GND GND
9 Y6 Output 6
10 Y5 Output 5
11 Y4 Output 4
12 Y3 Output 7
13 Y2 Output 7
14 Y1 Output 7
15 Y0 Output 7
16 VCC Supply Voltage
Block Diagram
S74HC138
2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
(and designs) are registered trademarks of SUM Semiconductor Corporation.
Copyright SUM Semiconductor Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.