74HC138

74HC138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
Pin Assignments
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.
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)
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

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)
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
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74HC138
Pin Descriptions
Pin Number
1
2
3
4
Pin Name
A0
A1
A2
E1
Enable Input 1 (active LOW)
5
E2
E3
Y7
GND
Y6
Y5
Y4
Y3
Y2
Y1
Y0
Vcc
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
6
7
8
9
10
11
12
13
14
15
16
Description
Address Input 0
Address Input 1
Address Input 2
Enable Input 2 (active LOW)
Function Table Diagram
Control
Input
Output
E1
H
E2
X
E3
A2
A1
A0
X
X
X
X
Y7
H
Y6
H
Y5
H
Y4
H
Y3
H
Y2
H
Y1
H
Y0
H
X
H
X











X
X
L











L
L
H




L

L

L

H

H

H

H

H

H

H

L



L
L
H
H
H
H
H
H
H
L
H



L
H
L
H
H
H
H
H
L
H
H



L
H
H
H
H
H
H
L
H
H
H



H
L
L
H
H
H
L
H
H
H
H



H
L
H
H
H
L
H
H
H
H
H



H
H
L
H
L
H
H
H
H
H
H



H
H
H
L
H
H
H
H
H
H
H
74HC138
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74HC138
Logic Diagram
74HC138
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Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD CDM
ESD MM
Description
Human Body Model ESD Protection
Charged Device Model ESD Protection
Machine Model ESD Protection
Rating
2
1
200
Unit
kV
kV
V
V
Supply Voltage Range
-0.5 to +7.0
VI
Input Voltage Range
-0.5 to +7.0
V
Vo
Voltage applied to output in high or low state
-0.3 to VCC +0.5
V
IIK
Input Clamp Current
VI< -0.5V
-20
mA
mA
VCC
IIK
Input Clamp Current
VI > VCC +0.5V
20
IOK
Output Clamp Current
VO<-0.5V
-20
mA
IOK
Output Clamp Current
VO> VCC + 0.5V
20
mA
IO
Continuous output current
±25
mA
ICC
Continuous current through VCC
50
mA
IGND
Continuous current through GND
-50
mA
TJ
°C
Operating Junction Temperature
-40 to +150
TSTG
Storage Temperature
-65 to +150
°C
PTOT
Total Power Dissipation
500
mW
Note:
4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be
within recommend values.
Recommended Operating Conditions (Note 5) (@TA = +25°C, unless otherwise specified.)
Symbol
Min
Max
Supply Voltage

2.0
6.0
V
VI
Input Voltage

0
VCC
V
VO
Output Voltage
V
VCC
Parameter
Conditions
Active Mode
0
VCC
VCC = 2.0V

1000

500
t/V
Input transition Rise or Fall Rate
VCC = 4.5V
TA
Operating Free-Air Temperature

VCC = 6.0V
Note:
Unit
ns/V

400

-40
+125
°C
5. Unused inputs should be held at VCC or Ground.
74HC138
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Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
VIH
VIL
VOH
Parameter
High-Level
Input Voltage
Low-Level
Input Voltage
High-Level
Output Voltage

2.0V

4.5V
TA = +25°C
Min
Typ Max
1.2
1.5

2.4
3.15


6.0V
4.2

2.0V


4.5V

6.0V
Test Conditions
IOH = -20 μA
All outputs
IOH = -4 mA
IOH = -5.2 mA
VOL
Low-Level
Output Voltage
IOL = 20 μA
All outputs
IOL = 4 mA
VCC
TA = -40°C to +85°C
Min
Max
TA = -40°C to +125°C
Min
Max
1.5

1.5

3.15

3.15

4.2


0.5
4.2
0.8

0.5


0.5

2.1
1.35

1.35

1.35
2.8
1.8



1.9
1.8
2.0

1.9
1.8
2.0V

1.9
4.5V
4.4
4.5

4.4

4.4

6.0V
5.9
6.0

5.9

5.9

4.5V
3.98
4.32

3.84

3.7

3.2
Unit
V
V

6.0V
5.48
5.81

5.34

5.2

2.0V

0
0.1

0.1

0.1
4.5V

0
0.1

0.1

0.1
6.0V

0
0.1

0.1

0.1
4.5V

0.15
0.26

0.33

0.4
V
V
IOL = 5.2 mA
6.0V

0.16
0.26

0.33

0.4
Input Current
VI =GND or 6.0V
6.0V


±0.1

±1

±1
μA
ICC
Supply Current
VI = GND or VCC
IO = 0
6.0V


8.0

80

160
μA
Ci
Input
Capacitance
Vi = VCC or GND
6.0V

4
10

10

10
pF
II
Switching Characteristics
Symbol /
Parameter
Pins
Test Conditions
An to Yn
Figure 1
tPLH,
tPLH
E3 to Yn
Figure 1
Propagation
Delay
En to Yn
tTLH,
tTHL
Transition
Time
Yn
74HC138
Document number: DS35488 Rev.3 - 2
Figure 1
Figure 1
VCC
Min
TA = +25°C
Typ
Max
-40°C to +85°C
-40°C to +125°C
Min
Max
Min
Max
2.0V

41
150

190

225
4.5V

15
30

38

45
5.0V

12


12


33

6.0V

26


38
2.0V

47
150

190

225
4.5V

17
30

38

45
5.0V

14


6.0V

14

26


33


38
2.0V

47
150

190

225
4.5V

17
30

38

45
5.0V

14





6.0V

14
26

33

38
2.0V

19
75

95

110
5.0V

7
15

19

22
6.0V

6
13

16

19
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Unit
ns
ns
June 2013
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74HC138
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Test
Conditions
VCC = 5V
Typ
Unit
f = 1 MHz all outputs switching-no load
19
pF
Parameter
Power dissipation
capacitance
Cpd
Parameter Measurement Information
Vcc
2.0V -6.0V
5.0V
Inputs
VI
VCC
tr/tf
6 ns
VCC
6 ns
CL
VM
VCC/2
50pF
VCC/2
15pF used for 5V typical test
Voltage Waveform
Pulse Duration
Voltage Waveform
Propagation Delay Times
Inverting and Non Inverting Outputs
Notes:
A. Includes test lead and test apparatus capacitance.
B. All pulses are supplied at pulse repetition rate ≤ 10 MHz.
C. Inputs are measured separately one transition per measurement
D. tPLH and tPHL are the same as tPD
Figure 1 Load Circuit and Voltage Waveforms
74HC138
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74HC138
Ordering Information
Notes:
Part Number
Package Code
Packaging
74HC138S16-13
74HC138T16-13
S16
T16
SO-16
TSSOP-16
7” Tape and Reel (Note 6)
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
6. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf
Marking Information
(1) SO-16, TSSOP16
Part Number
74HC138S16
74HC138T16
74HC138
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Package
SO-16
TSSOP-16
June 2013
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74HC138
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
Package Type: SO-16
H
E
Gauge Plane

L
Detail ‘A’
D
A
A2
e
B
A1
C
SO-16
Dim
Min
Max
A
1.40
1.75
A1
0.10
0.25
A2
1.30
1.50
B
0.33
0.51
C
0.19
0.25
D
9.80
10.00
E
3.80
4.00
e
1.27 Typ
H
5.80
6.20
L
0.38
1.27
Θ
0
8
All Dimensions in mm
Detail ‘A’
Package Type: TSSOP-16
E/2
SEE DETAIL 'A'
E1
E
Y
X
PIN 1
x)
b
e

Ø0.760Depth0.050±0.02
A2
R1
D
R
L2
C
GAUGE
PLANE
A
L
SEATING PLANE
A1
L1

TSSOP-16
Dim Min Max Typ
A
1.08
A1 0.05 0.15
A2 0.80 0.93
b 0.19 0.30
c 0.09 0.20
D 4.90 5.10
E
6.40 BSC
E1 4.30 4.50
e
0.65 BSC
L 0.45 0.75
L1
1.00 REF
L2
0.25 BSC
R 0.09
R1 0.09
X
1.350
Y
1.050
Θ
0°
8°
Θ1
5°
15°
Θ2
0°
All Dimensions in mm
DETAIL 'A'
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74HC138
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
Package Type: SO-16
X1
Y1
Y
Dimensions
C
X
X1
Y
Y1
Value (in mm)
1.270
0.670
9.560
1.450
6.400
Pin 1
C
X
Package Type: TSSOP-16
X1
Dimensions
C
X
X1
Y
Y1
Y1
Y (16x)
Value (in mm)
0.650
0.350
4.900
1.400
6.800
1
X (16x)
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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