74VHCT257A 查看數據表（PDF） - STMicroelectronics
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74VHCT257A Datasheet PDF : 10 Pages
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74VHCT257A
DC SPECIFICATIONS
Symb ol
Parameter
VIH High Level Input
Voltage
VIL Low Level Input
Voltage
VOH High Level Output
Voltage
VOL Low Level Output
Voltage
IOZ High Impedance
Output Leakage
Current
II Input Leakage Current
ICC Quiescent Supply
Current
∆ICC Additional Worst Case
Supply Current
IOPD Output Leakage
Current
Test Conditions
V CC
( V)
4.5 to 5.5
4.5 to 5.5
4.5
4.5
4.5
4.5
4.5 to 5.5
IO=-50 µA
IO=-8 mA
IO=50 µA
IO=8 mA
VI = VIH or VIL
VO = 0V to 5.5V
0 to 5.5
5.5
VI = 5.5V or GND
VI = VCC or GND
5.5
One Input at 3.4V,
other input at VCC or
GND
0
VOUT = 5.5V
Value
TA = 25 oC
Min. Typ. Max.
2
-40 to 85 oC
Min . Max.
2
0.8
0.8
4.4 4.5
4.4
3.94
3.8
0.0 0.1
0.1
0.36
0.44
±0.25
±2.5
±0.1
±1.0
4
40
1.35
1.5
0.5
5.0
Un it
V
V
V
V
µA
µA
µA
mA
µA
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)
Symb ol
Parameter
tPLH Propagation Delay
tPHL Time A, B to Y
tPLH Propagation Delay
tPHL Time SELECT to Y
tPZL Output Enable Time
tPZH
tPLZ Output Disable Time
tPHZ
(*) Voltage range is 5V ± 0.5V
Test Condition
V CC
CL
( V)
(pF)
5.0(*)
15
5.0(*)
50
5.0(*)
15
5.0(*)
50
5.0(*)
15
5.0(*)
50
5.0(*)
50
Value
TA = 25 oC
Min. Typ. Max.
5.8 9.3
8.3 12.8
7.0 11.0
9.5 14.5
6.7 10.5
9.2 14.0
8.6 12.0
-40 to 85 oC
Min . Max.
1.0 11.0
1.0 14.5
1.0 13.0
1.0 16.5
1.0 12.5
1.0 16.0
1.0 13.5
Unit
ns
ns
ns
ns
4/9
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