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74HC138 Datasheet

3 TO 8 LINE DECODER DEMULTIPLEXER

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74HC138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
The 74HC138 is a high speed CMOS device.
The device accepts a three bit binary weighted address on input pins
A0, A1 and A2 and when enabled will produce one active low output
with the remaing seven being high.
There are two active LOW enable inputs E1 and E2, and one active
HIGH enable input E3. The disabled device state results in all outputs
being high. The enable state occurs with E1 and E2 asserted low and
E3 asserted high.
The multiple enable lines allow for the parallel expansion of decoders
to create 4-to-16 line versions with no additional parts and 5-to-32
versions with the addition of a single inverter.
Pin Assignments
Features
Wide Supply Voltage Range from 2.0V to 6.0V
Sinks or sources 8 mA at VCC = 4.5V
CMOS low power consumption
Schmitt Trigger Action at All Inputs
Inputs Accept up to 6.0V
ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115-A)
Exceeds 2000-V Human Body Model (A114-A)
Exceeds 1000-V Charged Device Model (C101C)
Latch-Up Exceeds 100mA per JESD 78D, Class II
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Memory chip select decoding
Demultiplexing
Single line peripheral control
Allow simple serial bit streams from a microcontroller to control as
many peripheral lines as needed
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Click here for ordering information, located at the end of datasheet
74HC138
Document number: DS35488 Rev.3 - 2
1 of 10
www.diodes.com
June 2013
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

74HC138 Datasheet

3 TO 8 LINE DECODER DEMULTIPLEXER

No Preview Available !

Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
A0
A1
A2
E1
E2
E3
Y7
GND
Y6
Y5
Y4
Y3
Y2
Y1
Y0
Vcc
Description
Address Input 0
Address Input 1
Address Input 2
Enable Input 1 (active LOW)
Enable Input 2 (active LOW)
Enable Input 3 (active HIGH)
Output 7 (active LOW)
Ground
Output 6 (active LOW)
Output 5 (active LOW)
Output 4 (active LOW)
Output 3 (active LOW)
Output 2 (active LOW)
Output 1 (active LOW)
Output o (active LOW)
Supply Voltage
74HC138
Function Table Diagram
Control
Input
Output
E1 E2 E3 A2 A1 A0 Y7 Y6 Y5 Y4 Y3 Y2 Y1
HX X X X XHHHHH HH
XHX          
XX L          
LLH  
   L L L HHHHH HH
   L L HHHHHH H L
   L H L HHHHH L H
   L HHHHHH L HH
 HL LHHHLHHH
 HLHHHLHHHH
   HH L H L HHH HH
   HHH L HHHH HH
Y0
H
L
H
H
H
H
H
H
H
74HC138
Document number: DS35488 Rev.3 - 2
2 of 10
www.diodes.com
June 2013
© Diodes Incorporated


Part Number 74HC138
Description 3 TO 8 LINE DECODER DEMULTIPLEXER
Maker Diodes
Total Page 10 Pages
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