SN74LS157N(1999) 查看數據表（PDF） - ON Semiconductor
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SN74LS157N Datasheet PDF : 8 Pages
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SN74LS157
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
Guaranteed Input HIGH Voltage for
V
All Inputs
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
Input Clamp Diode Voltage
– 0.65 – 1.5
V
VCC = MIN, IIN = – 18 mA
VOH
Output HIGH Voltage
2.7
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
0.25 0.4
0.35 0.5
V
IOL = 4.0 mA
V
IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
Input HIGH Current
I0, I1
IIH
E, S
I0, I1
E, S
20
µA VCC = MAX, VIN = 2.7 V
40
0.1
0.2
mA VCC = MAX, VIN = 7.0 V
Input LOW Current
IIL
I0, I1
E, S
– 0.4 mA VCC = MAX, VIN = 0.4 V
– 0.8
IOS
Short Circuit Current (Note 1)
– 20
– 100 mA
ICC
Power Supply Current
16
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
VCC = MAX
VCC = MAX
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay
Data to Output
Propagation Delay
Enable to Output
Propagation Delay
Select to Output
Limits
Min Typ Max Unit
9.0
9.0
14
14
ns
13
14
20
21
ns
15
18
23
27
ns
Test Conditions
Figure 2
Figure 1
VCC = 5.0 V
CL = 15 pF
Figure 2
AC WAVEFORMS
VIN
VOUT
1.3 V
tPHL
1.3 V
1.3 V
tPLH
1.3 V
Figure 1.
VIN
VOUT
1.3 V
tPHL
1.3 V
1.3 V
tPLH
1.3 V
Figure 2.
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