DM74LS138 • DM74LS139
Absolute Maximum Ratings
(Note 2)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
7V
0°C to
+70°C
−65°C
to
+150°C
Note 2:
The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
DM74LS138 Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
0
Parameter
Min
4.75
2
0.8
−0.4
8
70
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°C
DM74LS138 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OS
I
CC
Parameter
Input Clamp Voltage
HIGH Level Output Voltage
LOW Level
Output Voltage
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
Conditions
V
CC
=
Min, I
I
= −18
mA
V
CC
=
Min, I
OH
=
Max, V
IL
=
Max, V
IH
=
Min
V
CC
=
Min, I
OL
=
Max, V
IL
=
Max, V
IH
=
Min
I
OL
=
4 mA, V
CC
=
Min
V
CC
=
Max, V
I
=
7V
V
CC
=
Max, V
I
=
2.7V
V
CC
=
Max, V
I
=
0.4V
V
CC
=
Max (Note 4)
V
CC
=
Max (Note 5)
−20
6.3
2.7
3.4
0.35
0.25
0.5
0.4
0.1
20
−0.36
−100
10
Min
Typ
(Note 3)
Max
−1.5
Units
V
V
V
mA
µA
mA
mA
mA
Note 3:
All typicals are at V
CC
=
5V, T
A
=
25°C.
Note 4:
Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 5:
I
CC
is measured with all outputs enabled and OPEN.
DM74LS138 Switching Characteristics
at V
CC
=
5V and T
A
=
25°C
From (Input)
Symbol
Parameter
To (Output)
Levels
of Delay
C
L
=
15 pF
Min
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Select to Output
Select to Output
Select to Output
Select to Output
Enable to Output
Enable to Output
Enable to Output
Enable to Output
2
2
3
3
2
2
3
3
Max
18
27
18
27
18
24
18
28
R
L
=
2 kΩ
C
L
=
50 pF
Min
Max
27
40
27
40
27
40
27
40
ns
ns
ns
ns
ns
ns
ns
ns
Units
3
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