74VHC257(2004) 查看數據表（PDF） - STMicroelectronics
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74VHC257 Datasheet PDF : 14 Pages
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74VHC257
Table 7: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition
Symbol
Parameter
VCC CL
(V) (pF)
tPLH
tPHL
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
Propagation Delay 3.3(*) 15
Time A, B to Y
3.3(*) 50
5.0(**) 15
5.0(**) 50
Propagation Delay 3.3(*) 15
Time
SELECT to Y
3.3(*) 50
5.0(**) 15
5.0(**) 50
Output Enable
Time
3.3(*) 15
3.3(*) 50
5.0(**) 15
5.0(**) 50
Output Disable
Time
3.3(*) 50
5.0(**) 50
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5.0V ± 0.5V
Table 8: Capacitive Characteristics
Value
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
5.8 9.3 1.0 11.0 1.0 11.0
8.3 12.8 1.0 14.5 1.0 14.5
ns
3.6 5.9 1.0 7.0 1.0 7.0
5.1 7.9 1.0 9.0 1.0 9.0
7.0 11.0 1.0 13.0 1.0 13.0
9.5 14.5 1.0 16.5 1.0 16.5
ns
4.0 6.8 1.0 8.0 1.0 8.0
5.5 8.8 1.0 10.0 1.0 10.0
6.7 10.5 1.0 12.5 1.0 12.5
9.2 14.0 1.0 16.0 1.0 16.0
ns
3.6 6.8 1.0 8.0 1.0 8.0
5.1 8.8 1.0 10.0 1.0 10.0
8.6 12.0 1.0 13.5 1.0 13.5
ns
5.7 7.9 1.0 9.0 1.0 9.0
Symbol
Parameter
CIN
COUT
CPD
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
(note 1)
Test Condition
Value
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
6 10
10
10 pF
8
pF
18
pF
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/4 (per
channel)
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