74AHC138

74AHC138
3-TO-8 LINE DECODER DEMULTIPLEXER
Description
Pin Assignments
The 74AHC138 is an advanced 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 remaining seven being high.
Preliminary
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 E 1 and E 2
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 2.0 V to 5.5 V
•
•
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
•
Inputs accept up to 5.5 V
•
ESD Protection Tested per JESD 22
Memory chip select decoding
as 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
•
SO16 Available in “Green” Molding Compound
(no Br, Sb)
•
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
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 < 1000 ppm antimony compounds.
Click for Ordering Information
74AHC138
Document number: DS35482 Rev. 2 - 2
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74AHC138
Pin Descriptions
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
Enable Input 2 (active LOW)
6
E3
Enable Input 3 (active HIGH)
7
Y7
Output 7 (active LOW)
8
GND
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
Preliminary
Pin Number
Description
Ground
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
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74AHC138
Preliminary
Logic Diagram
74AHC138
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Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD CDM
ESD MM
VCC
Preliminary
VI
Rating
Unit
Human Body Model ESD Protection
2
KV
Charged Device Model ESD Protection
1
KV
Machine Model ESD Protection
200
V
Supply Voltage Range
-0.5 to 7.0
V
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
IOK
Output Clamp Current
VO < -0.5V
-20
mA
VO > VCC +0.5 V
20
mA
+/- 25
mA
IOK
Output Clamp Current
IO
Continuous output current
ICC
Continuous current through VCC
75
mA
IGND
Continuous current through GND
-75
mA
Operating Junction Temperature
-40 to +150
°C
TSTG
Storage Temperature
-65 to +150
°C
PTOT
Total Power Dissipation
500
mW
TJ
Notes:
Description
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)
Symbol
Parameter
(@TA = +25°C, unless otherwise specified.)
Conditions
Min
Max
Unit
2.0
5.5
V
Supply Voltage

VI
Input Voltage

0
5.5
V
VO
Output Voltage
Active Mode
0
VCC
V
VCC = 3.0 V ± 0.3 V

100
VCC = 5.0 V ± 0.5 V

20
-40
+125
VCC
t/V
Input transition rise or fall rate
TA
Operating free-air temperature
Notes:

ns/V
°C
5. Unused inputs should be held at VCC or Ground.
74AHC138
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74AHC138
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
TA = +25°C
Symbol
VIH
Preliminary
VIL
VOH
VOL
Parameter
High-level Input
Voltage
Low-level input
voltage
High Level
Output Voltage
Test Conditions
Vcc
-40°C to +85°C
-40°C to +125°C
Min
Typ
Max
Min
Max
Min
Max
Unit

2.0V
1.5


1.5

1.5


3.0V
2.1


2.1

2.1


5.5V
3.85


3.85

3.85


2.0V


0.5

0.5

0.5

3.0V


0.9

0.9

0.9

5.5V


1.65

1.65

1.65
IOH = -50 μA
2.0V
1.9
2.0

1.9

1.9

IOH = -50 μA
3.0V
2.9
3.0

2.9

2.9

IOH = -50 μA
4.5V
4.4
4.5

4.4

4.4


IOH = -4 mA
3.0V
2.58


2.48

2.40
IOH = -8 mA
4.5V
3.94


3.80

3.70

IOL = 50 μA
2.0V


0.1

0.1

0.1
IOL = 50 μA
Low-level Output I = 50 μA
OL
Voltage
IOL = 4 mA
3.0V


0.1

0.1

0.1
4.5V


0.1

0.1

0.1
3.0V


0.36

0.44

0.55
V
V
V
V
IOL = 8 mA
4.5V


0.36

0.44

0.55
Input Current
VI =GND or 5.5 V
5.5V


0.1

±1

±2
μA
ICC
Supply Current
VI = GND or VCC
IO=0 A
5.5V


4.0

40

80
μA
Ci
Input
Capacitance
Vi = VCC or GND
5.5V

4.0
10

10

10
pF
II
Switching Characteristics
Symbol
Parameter
Propagation
Delay An to Yn
tPD
Propagation
Delay E3 to Yn
Propagation
Delay En to Yn
Test
Conditions
TA = +25°C
Vcc
-40°C to +85°C
-40°C to +125°C
Min
Typ.
Max
Min
Max
Min
Max
Figure 2
3.0 V to 3.6V
0.5
4.4
8.0
0.5
9.5
0.5
11.5
CL=15 pF
4.5 V to 5.5 V
0.5
3.0
5.5
0.5
6.5
0.5
7.0
Figure 2
3.0 V to 3.6V
0.5
6.2
11.5
0.5
13.0
0.5
14.5
CL=50pF
4.5 V to 5.5 V
0.5
4.3
7.5
0.5
8.5
0.5
9.5
0.5
4.7
8.0
0.5
9.5
0.5
11.5
Figure 2
3.0 V to 3.6V
CL=15 pF
4.5 V to 5.5 V
0.5
3.3
5.1
0.5
6.0
0.5
7.5
Figure 2
3.0 V to 3.6V
0.5
6.8
11.5
0.5
13.0
0.5
14.5
CL=50pF
4.5 V to 5.5 V
0.5
4.7
7.1
0.5
8.0
0.5
9.0
Figure 2
3.0 V to 3.6V
0.5
6.7
9.7
0.5
11.5
0.5
12.5
CL=15 pF
4.5 V to 5.5 V
0.5
4.8
6.8
0.5
8.0
0.5
8.5
Figure 2
3.0 V to 3.6V
0.5
9.6
13.2
0.5
15.0
0.5
16.5
CL=50pF
4.5 V to 5.5 V
0.5
6.8
8.8
0.5
10.0
0.5
11.0
74AHC138
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Unit
ns
ns
ns
June 2013
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74AHC138
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter
Cpd
Test Conditions
Power dissipation capacitance
f = 1 MHz all outputs switching-no load
VCC = 5 V
Unit
TYP
18
pF
Preliminary
Parameter Measurement Information
Vcc
Inputs
VM
CL
6ns
VCC/2
50pF
6ns
VCC/2
15pF used for 5V typical test
VI
tr/tf
2.0V -6.0V
VCC
5.0V
VCC
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
74AHC138
Document number: DS35482 Rev. 2 - 2
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74AHC138
Preliminary
Ordering Information
Device
Package Code
7” Tape and Reel (Note 7
Packaging
(Note 6)
Quantity
Part Number Suffix
74AHC138S16-13
S16
SO-16
2500/Tape & Reel
-13
74AHC138T16-13
T16
TSSOP-16
2500/Tape & Reel
-13
Notes:
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
7. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf
Marking Information
(1) SO-16, TSSOP-16
74AHC138
Document number: DS35482 Rev. 2 - 2
Part Number
Package
74AHC138S16
74AHC138T16
SO-16
TSSOP-16
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74AHC138
Package Outline Dimensions (All Dimensions in mm)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
(1) Package Type: SO-16
SOIC-16
D
Dim
E/2
E1/2
E
Preliminary
E1
b 16X
e
A1
A
SEATING PLANE
Min
Max
Typ
A
-
1.75
-
A1
0.10
0.25
-
b
0.31
0.51
-
c
0.10
0.25
-
D
9.80
10.00
-
E
5.80
6.20
-
E1
3.80
4.00
-
e
-
-
1.27
L
0.40
1.27
-
Ø
0°
8°
-
Ø1
5°
15°
-
All Dimensions in mm
DETAIL 'A'
8X Ø1
TSSOP-16
GAUGE PLANE
SEATING PLANE
L
Ø
(2) Package Type: TSSOP-16
Dim
Min
Max
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
E1
6.40 BSC
4.30
e
L
E/2
SEE DETAIL 'A'
0.45
Y
X
PIN 1
x)
b
e
A2
0.75
-
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

Ø0.760Depth0.050±0.02
-
1.00 REF
L2
E1
4.50
0.65 BSC
L1
E
Typ
R1
D
R
C
L2
GAUGE
PLANE
A
L
SEATING PLANE
A1
74AHC138
Document number: DS35482 Rev. 2 - 2

L1
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74AHC138
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(1) Package Type: SO-16
X1
Preliminary
Dimensions
C
X
X1
Y
Y1
Y1
Value
(in mm)
1.270
0.670
9.560
1.450
6.400
Y
Pin 1
C
X
(2) Package Type: TSSOP-16
X1
Y1
Y (16x)
Dimensions
Value
(in mm)
C
0.650
X
0.350
X1
4.900
Y
1.400
Y1
6.800
1
X (16x)
74AHC138
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74AHC138
IMPORTANT NOTICE
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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).
Preliminary
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without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
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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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the
express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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labeling can be reasonably expected to result in significant injury to the user.
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the
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its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
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