74HCT138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
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.
Pin Assignments
Features
•
•
•
•
•
•
•
Wide Supply Voltage Range from 4.5V to 5.5V
Sinks or sources 8mA at V
CC
= 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 250mA per JESD 78, 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
74HCT138
Document number: DS35489 Rev. 3 - 2
1 of 10
www.diodes.com
June 2013
© Diodes Incorporated
74HCT138
Absolute Maximum Ratings
(Note 4) (@T
A
= +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD CDM
ESD MM
V
CC
V
I
V
o
I
IK
I
IK
I
OK
I
OK
I
O
I
CC
I
GND
T
J
T
STG
P
TOT
Note:
Description
Human Body Model ESD Protection
Charged Device Model ESD Protection
Machine Model ESD Protection
Supply Voltage Range
Input Voltage Range
Voltage Applied to Output in High or Low State
Input Clamp Current V
I
< -0.5V
Input Clamp Current V
I
> V
CC
+ 0.5V
Output Clamp Current V
O
< -0.5V
Output Clamp Current V
O
> V
CC
+ 0.5V
Continuous Output Current
Continuous Current Through V
CC
Continuous Current Through GND
Operating Junction Temperature
Storage Temperature
Total Power Dissipation
Rating
2
1
200
-0.5 to 7.0
-0.5 to 7.0
-0.3 to V
CC
-20
20
-20
20
+/- 25
50
-50
-40 to 150
-65 to 150
500
Unit
KV
KV
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
°C
°C
mW
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) (@T
A
= +25°C, unless otherwise specified.)
Symbol
Parameter
Supply Voltage
Input Voltage
Output Voltage
Input transition rise or fall rate
Operating free-air temperature
5. Unused inputs should be held at V
CC
or Ground.
Conditions
Active Mode
V
CC
= 4.5V
Min
4.5
0
0
-40
Max
5.5
Vcc
V
CC
100
125
Unit
V
V
V
ns/V
°C
V
CC
V
I
V
O
t/V
T
A
Note:
74HCT138
Document number: DS35489 Rev. 3 - 2
4 of 10
www.diodes.com
June 2013
© Diodes Incorporated
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