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74HC138 Datasheet PDF - Diodes

Part Number 74HC138
Description 3 TO 8 LINE DECODER DEMULTIPLEXER
Manufacturers Diodes 
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74HC138 datasheet, circuit
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

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74HC138 equivalent
74HC138
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Test Conditions
VIH
High-Level
Input Voltage
VIL
Low-Level
Input Voltage
IOH = -20 μA
VOH
High-Level
All outputs
Output Voltage
IOH = -4 mA
IOH = -5.2 mA
IOL = 20 μA
VOL
Low-Level
All outputs
Output Voltage
IOL = 4 mA
IOL = 5.2 mA
II Input Current VI =GND or 6.0V
ICC
Supply Current VI = GND or VCC
IO = 0
Ci
Input
Capacitance
Vi = VCC or GND
VCC
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
4.5V
6.0V
2.0V
4.5V
6.0V
4.5V
6.0V
6.0V
6.0V
6.0V
TA = +25°C
Min Typ Max
1.5 1.2
3.15 2.4
4.2 3.2
0.8 0.5
2.1 1.35
2.8 1.8
1.9 2.0
4.4 4.5
5.9 6.0
3.98 4.32
5.48 5.81
0 0.1
0 0.1
0 0.1
0.15 0.26
0.16 0.26
  ±0.1
TA = -40°C to +85°C
Min Max
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.33
0.33
±1
8.0
80
TA = -40°C to +125°C
Min Max
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.7
5.2
0.1
0.1
0.1
0.4
0.4
±1
Unit
V
V
V
V
μA
160 μA
4 10
10
10 pF
Switching Characteristics
Symbol /
Parameter
Pins
Test Conditions
An to Yn
tPLH,
tPLH
Propagation
Delay
E3 to Yn
En to Yn
Figure 1
Figure 1
Figure 1
tTLH,
tTHL
Transition
Time
Yn
Figure 1
VCC
2.0V
4.5V
5.0V
6.0V
2.0V
4.5V
5.0V
6.0V
2.0V
4.5V
5.0V
6.0V
2.0V
5.0V
6.0V
TA = +25°C
Min Typ Max
41 150
15 30
12
12 26
47 150
17 30
14
14 26
47 150
17 30
14
14 26
19 75
7 15
6 13
-40°C to +85°C
Min Max
190
38

33
190
38

33
190
38

33
95
19
16
-40°C to +125°C
Min Max
225
45

38
225
45

38
225
45

38
110
22
19
Unit
ns
ns
74HC138
Document number: DS35488 Rev.3 - 2
5 of 10
www.diodes.com
June 2013
© Diodes Incorporated

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