74HCT138

74HCT138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
Pin Assignments
The 74HCT138 is a high speed CMOS device that is designed to be
pin compatable with 74LS low power Schottky types.
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
Applications
•
Wide Supply Voltage Range from 4.5V to 5.5V
•
Memory chip select decoding
•
Sinks or sources 8mA at VCC = 4.5V
•
Demultiplexing
•
CMOS low power consumption
•
Single line peripheral control
•
Schmitt Trigger Action at All Inputs
•
Allow simple serial bit streams from a microcontroller to control as
•
Inputs accept up to 6.0V
•
ESD Protection Tested per JESD 22
many peripheral lines as needed.

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 250mA per JESD 78, 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
74HCT138
Document number: DS35489 Rev. 3 - 2
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74HCT138
Pin Descriptions
Pin Number
Pin Name
1
A0
Address Input 0
2
A1
Address Input 1
3
A2
Address Input 2
4
E1
Enable Input 1 (active LOW)
5
E2
6
E3
Enable Input 3 (active HIGH)
7
Y7
Output 7 (active LOW)
8
GND
Description
Enable Input 2 (active LOW)
Ground
9
Y6
Output 6 (active LOW)
10
Y5
Output 5 (active LOW)
11
Y4
Output 4 (active LOW)
12
Y3
Output 3 (active LOW)
13
Y2
Output 2 (active LOW)
14
Y1
Output 1 (active LOW)
15
Y0
Output o (active LOW)
16
Vcc
Supply Voltage
Function Table Diagram
Control
Input
Output
E1
E2
E3
A2
A1
A0
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
H
X
X
X
X
X
H
H
H
H
H
H
H
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
74HCT138
Document number: DS35489 Rev. 3 - 2
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74HCT138
Logic Diagram
74HCT138
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74HCT138
Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol
Description
Rating
Unit
ESD HBM
Human Body Model ESD Protection
2
KV
ESD CDM
Charged Device Model ESD Protection
1
KV
ESD MM
Machine Model ESD Protection
200
V
VCC
Supply Voltage Range
-0.5 to 7.0
V
VI
Input Voltage Range
-0.5 to 7.0
V
Vo
Voltage Applied to Output in High or Low State
-0.3 to VCC
V
IIK
Input Clamp Current VI < -0.5V
-20
mA
mA
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
Operating Junction Temperature
-40 to 150
°C
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
VCC
VI
VO
Min
Max
Unit
Supply Voltage
Parameter
Conditions

4.5
5.5
V
Input Voltage

0
Vcc
V
Active Mode
0
VCC
V
t/V
Input transition rise or fall rate
VCC = 4.5V

100
ns/V
TA
Operating free-air temperature

-40
125
°C
Note:
Output Voltage
5. Unused inputs should be held at VCC or Ground.
74HCT138
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74HCT138
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
VIH
High-level
Input Voltage

VIL
Low-level
input voltage

VOH
High Level
Output
Voltage
VOL
Low-level
Output
Voltage
II
ICC
∆ICC
Test Conditions
Vcc
-40°C to 85°C
-40°C to 125°C
Unit
Min
Typ
Max
Min
Max
Min
Max
4.5V to 5.5V
2.0
1.6

2.0

2.0

V
4.5V to 5.5V

1.2
0.8

0.8

0.8
V
IOH = -20 μA
4.5V
4.4
4.5

4.4

4.4

IOH = -4 mA
4.5V
3.98
4.32

3.85

3.7
IOL = 20 μA
4.5V

0
0.1

0.1

0.1

0.15
0.26

0.33

0.4

±0.1

±1

±1
μA

8.0

80

160
μA
150
540

675

735
IOL = 4 mA
4.5V
Input Current
VI =GND to
5.5 V
5.5V
Supply
Current
VI = GND or VCC
IO=0
5.5V
Additional
Supply
Current
TA = 25°C



V
V
Test Per
Pin
PINS
An

VI =
PIN En

125
450

563

613

100
360

450

490
μA

4
10

10

10
pF
μA
4.5V to 5.5V
Vcc -2.1 V
Other
VI = Vcc
or GND
PIN E3
IO=0
Ci
Input
Vi = VCC or GND
Capacitance
5.5V
Switching Characteristics
Symbol /
Parameter
tPLH,
tPLH
Propagation
Delay
tTLH,
tTHL
Transition
Time
Pins
Test
Conditions
An to Yn
Figure 2
E3 to Yn
Figure 2
En to Yn
Figure 2
Yn
Figure 2
74HCT138
Document number: DS35489 Rev. 3 - 2
Vcc
TA=25°C
-40°C to 85°C
-40°C to 125°C
Min
Typ.
Max
Min
Max
Min
Max
4.5V

20
35

35

45
5.0V

17





4.5V

18
40

40

45
5.0V

19





4.5V

19
40

40

45
5.0V

19





4.5 V

7
15

15

110
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Unit
ns
ns
June 2013
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74HCT138
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter
Cpd
VCC = 5V
Test Conditions
Power Dissipation Capacitance
Unit
TYP
f = 1 MHz all outputs switching-no load
21
pF
Parameter Measurement Information
Inputs
VCC
VM
CL
6ns
VCC/2
50pF
6ns
VCC/2
15pF used for 5V typical test
VI
tr/tf
4.5V
3V
5.0V
3V
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
74HCT138
Document number: DS35489 Rev. 3 - 2
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74HCT138
Ordering Information
Device
Package Code
74HCT138S16-13
74HCT138T16-13
Notes:
7” Tape and Reel(Note 7)
Packaging
(Note 6)
Quantity
Part Number Suffix
S16
SO-16
2500/Tape & Reel
-13
T16
TSSOP-16
2500/Tape & Reel
-13
6. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
http://www.diodes.com/datasheets/ap02001.pdf.
7. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf
Marking Information
(1) SO-16, TSSOP-16
Part Number
74HCT138
Document number: DS35489 Rev. 3 - 2
Package
74HCT138S16
SO-16
74HCT138T16
TSSOP-16
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74HCT138
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'
74HCT138
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74HCT138
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
Pin 1
Dimensions
C
X
X1
Y
Y1
Value (in mm)
1.270
0.670
9.560
1.450
6.400
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)
74HCT138
Document number: DS35489 Rev. 3 - 2
C
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74HCT138
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
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application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
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final and determinative format released by Diodes Incorporated.
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written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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