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54LS157 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54LS157 Quad 2-Line to 1-Line Data Selectors/Multiplexers National-Semiconductor
National ->Texas Instruments National-Semiconductor
54LS157 Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
’LS157 Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL e 2 kX
CL e 15 pF
CL e 50 pF
Min
Max
Min
Max
tPLH
Propagation Delay Time
Data
Low to High Level Output
to Y
14
18
tPHL
Propagation Delay Time
Data
High to Low Level Output
to Y
14
23
tPLH
Propagation Delay Time
Strobe
Low to High Level Output
to Y
20
24
tPHL
Propagation Delay Time
Strobe
High to Low Level Output
to Y
21
30
tPLH
Propagation Delay Time
Select
Low to High Level Output
to Y
23
28
tPHL
Propagation Delay Time
Select
High to Low Level Output
to Y
27
32
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
DM54LS158
Nom
Max
5
55
07
b0 4
4
125
DM74LS158
Min
Nom
Max
4 75
5
5 25
2
08
b0 4
8
0
70
’LS158 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
Input Clamp Voltage
VCC e Min II e b18 mA
High Level Output
Voltage
VCC e Min IOH e Max
DM54
25
VIL e Max VIH e Min
DM74
27
VOL
Low Level Output
VCC e Min IOL e Max
DM54
Voltage
VIL e Max VIH e Min
DM74
IOL e 4 mA VCC e Min
DM74
II
Input Current Max
VCC e Max
Input Voltage
VI e 7V
S or G
A or B
IIH
High Level Input
VCC e Max
Current
VI e 2 7V
S or G
A or B
IIL
Low Level Input
VCC e Max
Current
VI e 0 4V
S or G
A or B
IOS
Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b20
ICC
Supply Current
VCC e Max (Note 3)
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3 ICC is measured with 4 5V applied to all inputs and all outputs open
3
Typ
(Note 1)
34
34
0 25
0 35
0 25
48
Max
b1 5
04
05
04
02
01
40
20
b0 8
b0 4
b100
b100
8
Units
ns
ns
ns
ns
ns
ns
Units
V
V
V
mA
mA
C
Units
V
V
V
mA
mA
mA
mA
mA
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