74AHCT138

74AHCT138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
Pin Assignments
The 74AHCT138 is an advanced 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 remaining 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


Supply Voltage Range from 4.5V to 5.5V
Sinks or Sources 8mA at VCC = 4.5V

CMOS Low Power Consumption

Schmitt Trigger Action at All Inputs

Memory chip select decoding

Inputs Accept up to 6.0V

Demultiplexing

ESD Protection Tested per JESD 22

Single line peripheral control

Exceeds 200-V Machine Model (A115-A)


Exceeds 2000-V Human Body Model (A114-A)

Exceeds 1000-V Charged Device Model (C101C)
Applications

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:
Allow simple serial bit streams from a microcontroller to control as
many peripheral lines as needed
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
74AHCT138
Document number: DS35483 Rev. 2 - 2
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74AHCT138
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
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)
VCC
Supply Voltage
6
7
8
9
10
11
12
13
14
15
16
Description
Address Input 0
Address Input 1
Address Input 2
Function Table Diagram
Control
E1
H
X
X
L
E2
X
H
X
L
Input
Output
E3
A2
A1
A0
X
X
L
H
X
X
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
H
74AHCT138
Document number: DS35483 Rev. 2 - 2
X
Y7
H
Y6
H
Y5
H
Y4
H
Y3
H
Y2
H
Y1
H
Y0
H
L
H
L
H
L
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
H
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74AHCT138
Logic Diagram
74AHCT138
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74AHCT138
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
Supply Voltage Range
VCC
VI
Input Voltage Range
Vo
Voltage applied to output in high or low state
IIK
Input Clamp Current
IOK
Output Clamp Current
IOK
Output Clamp Current
VO> VCC + 0.5V
IO
Continuous output current
Rating
2
1
200
Unit
KV
KV
V
-0.5 to +7.0
V
-0.5 to +7.0
V
-0.3 to VCC +0.5
V
VI< -0.5V
-20
mA
VO<-0.5V
-20
mA
25
mA
+/- 25
mA
ICC
Continuous current through VDD or GND
75
mA
IGND
Continuous current through VDD or 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:
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
Parameter
Conditions
Supply Voltage
Input Voltage
Output Voltage
Active Mode
t/V
Input transition Rise or Fall Rate
VCC = 4.5V to 5.5V
TA
Operating Free-Air Temperature
VO
Note:
Min
Max
Unit
4.5
5.5
V
0
5.5
V
0
VCC
V
20
ns/V
+125
°C
-40
5. Unused inputs should be held at VCC or Ground.
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Test Conditions
VCC
TA = +25°C
Min
Typ Max
TA = -40°C to +85°C TA = -40°C to +125°C
Min
Max
Min
Max
VIL
High-level Input
Voltage
Low-level input
voltage
VOH
High Level
Output Voltage
IOH = -50μA
4.5V
4.4
4.5

4.4

4.4

IOH = -8mA
4.5V
3.94


3.80

3.70

VOL
Low-level Output IOL = 50μA
Voltage
IOL = 8mA
4.5V

0
0.1

0.1

0.1
4.5V


0.36

0.44

0.55
VIH
II
ICC
∆ICC
Ci
Unit
4.5V to 5.5V
2.0


2.0

2.0

V
4.5V to 5.5V


0.8

0.8

0.8
V
V
V
Input Current
VI = GND or 5.5V
0V to 5.5V

0.1
±0.1

±1

±2
μA
Supply Current
VI = GND or VCC
IO = 0
5.5V


4.0

40

80
μA
4.5V to 5.5V


1.35

1.5

1.5
mA
5.5V

4
10

10

10
pF
Additional
Supply Current
per Input
Input
Capacitance
VI = Vcc -2.1V
IO = 0
Vi = VCC or GND
74AHCT138
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74AHCT138
Switching Characteristics
Symbol
tPD
Parameter
Test Conditions
TA = +25°C
Min
Typ
Max
VCC
-40°C to +85°C
-40°C to +125°C
Min
Max
Min
Max
Propagation Delay Figure 2 CL =15pF
An to Yn
Figure 2 CL = 50pF
4.5V to 5.5V
0.5
4.4
10.4
1.0
12.0
1.0
13.0
4.5V to 5.5V
0.5
6.2
11.4
1.0
13.0
1.0
14.5
Propagation Delay Figure 2 CL = 15pF
E3 to Yn
Figure 2 CL = 50pF
4.5V to 5.5V
0.5
4.3
9.1
1.0
10.5
1.0
11.5
4.5V to 5.5V
0.5
6.2
10.1
1.0
11.5
1.0
13.0
Propagation Delay Figure 2 CL = 15pF
En to Yn
Figure 2 CL = 50pF
4.5V to 5.5V
0.5
4.3
9.6
1.0
11.0
1.0
12.0
4.5V to 5.5V
0.5
6.2
10.6
1.0
12.0
1.0
13.5
Unit
ns
ns
ns
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Test
Conditions
VCC = 5V
Typ
Unit
f = 1 MHz all outputs switching-no load
23
pF
Parameter
Power dissipation
capacitance
Cpd
Parameter Measurement Information
VCC
4.5V to 5.5V
Inputs
VI
3.0 V
VM
tr/tf
3ns
Input
Output
1.5 V
VCC/2
CL
15pF, 50pF
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.
74AHCT138
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74AHCT138
Figure 1. Load Circuit and Voltage Waveforms
Ordering Information
Part Number
Package Code
Packaging
74AHCT138S16-13
74AHCT138T16-13
S16
T16
SO-16
TSSOP-16
Notes:
7” Tape and Reel (Note 7)
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
7. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf
Marking Information
(1) SO-16, TSSOP16
Part Number
74AHCT138S16
74AHCT138T16
74AHCT138
Document number: DS35483 Rev. 2 - 2
Package
SO-16
TSSOP-16
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74AHCT138
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'
74AHCT138
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74AHCT138
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)
74AHCT138
Document number: DS35483 Rev. 2 - 2
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74AHCT138
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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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written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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