SN74LS251D データシートの表示（PDF） - ON Semiconductor
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SN74LS251D Datasheet PDF : 8 Pages
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SN74LS251
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
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
VOH
Output HIGH Voltage
2.4
3.1
V
VOL
Output LOW Voltage
0.25 0.4
V
0.35 0.5
V
IOZH
IOZL
IIH
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
20
µA
– 20
µA
20
µA
0.1
mA
IIL
Input LOW Current
– 0.4 mA
IOS
Short Circuit Current (Note 1)
– 30
– 130 mA
ICC
Power Supply Current
10
mA
12
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
IOL = 12 mA
IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VOUT = 2.7 V
VCC = MAX, VOUT = 0.4 V
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 0.4 V
VCC = MAX
VCC = MAX, VE = 0 V
VCC = MAX, VE = 4.5 V
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
Propagation Delay,
tPHL
Select to Z Output
20
21
33
33
ns
tPLH
Propagation Delay,
tPHL
Select to Z Output
29
45
28
45
ns
tPLH
Propagation Delay,
tPHL
Data to Z Output
10
9.0
15
15
ns
tPLH
Propagation Delay,
tPHL
Data to Z Output
17
18
28
28
ns
tPZH
Output Enable Time
tPZL
to Z Output
17
24
27
40
ns
tPZH
Output Enable Time
tPZL
to Z Output
30
26
45
40
ns
tPHZ
Output Disable Time
tPLZ
to Z Output
37
15
55
25
ns
tPHZ
Output Disable Time
tPLZ
to Z Output
30
15
45
25
ns
Test Conditions
Figure 1
Figure 2
Figure 1
Figures 2
CL = 15 pF,
RL = 2.0 kΩ
Figures 4, 5
Figures 3, 5
Figures 3, 5
Figures 4, 5
CL = 5.0 pF,
RL = 667 kΩ
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