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參數(shù)資料
| 型號： | 74LS138 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Decoder/Demultiplexer |
| 中文描述： | 解碼器/解復(fù)用器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大小： | 81K |
| 代理商： | 74LS138 |
www.fairchildsemi.com
4
D
DM74LS139 Recommended Operating Conditions
DM74LS139 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 6:
All typicals are at V
CC
=
5V, T
A
=
25
°
C.
Note 7:
Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 8:
I
CC
is measured with all outputs enabled and OPEN.
DM74LS139 Switching Characteristics
at V
CC
=
5V and T
A
=
25
°
C
Symbol
Parameter
Min
4.75
2
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°
C
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
0.8
0.4
8
70
0
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 6)
V
I
V
OH
Input Clamp Voltage
HIGH Level
Output Voltage
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 7)
V
CC
=
Max (Note 8)
1.5
V
2.7
3.4
V
V
OL
LOW Level
Output Voltage
0.35
0.5
V
0.25
0.4
I
I
I
IH
I
IL
I
OS
I
CC
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
0.1
20
0.36
100
11
mA
μ
A
mA
Short Circuit Output Current
Supply Current
20
mA
mA
6.8
From (Input)
R
L
=
2 k
Symbol
Parameter
To (Output)
C
L
=
15 pF
Min
C
L
=
50 pF
Min
Units
Max
Max
t
PLH
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
Select to Output
18
27
ns
t
PHL
Select to Output
27
40
ns
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
t
PLH
Enable to Output
18
27
ns
t
PHL
Propagation Delay Time
HIGH-to-LOW Level Output
Enable to Output
24
40
ns
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