74VHC245(2004) 查看數據表（PDF） - STMicroelectronics
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74VHC245 Datasheet PDF : 12 Pages
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74VHC245
Table 7: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition
Value
Symbol
Parameter
VCC CL
(V) (pF)
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
tOSLH
tOSHL
Propagation Delay 3.3(*) 15
Time
3.3(*) 50
5.0(**) 15
5.0(**) 50
Output Disable
Time
3.3(*) 15
3.3(*) 50
5.0(**) 15
5.0(**) 50
Output Enable
Time
3.3(*) 50
5.0(**) 50
Output to Output 3.3(*) 50
Skew time (note 1) 5.0(**) 50
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
RL = 1KΩ
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
5.8 8.4 1.0 10.0 1.0 10.0
8.3 11.9 1.0 13.5 1.0 13.5
ns
4.0 5.5 1.0 6.5 1.0 6.5
5.5 7.5 1.0 8.5 1.0 8.5
8.5 13.2 1.0 15.5 1.0 15.5
11.0 16.7 1.0 19.0 1.0 19.0
ns
5.8 8.5 1.0 10.0 1.0 10.0
7.3 10.6 1.0 12.0 1.0 12.0
11.5 15.8 1.0 18.0 1.0 18.0
ns
7.0 9.7 1.0 11.0 1.0 11.0
1.5
1.5
1.5
ns
1.0
1.0
1.0
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5.0V ± 0.5V
Note 1: Parameter guaranteed by design. tsoLH = |tpLHm - tpLHn|, tsoHL = |tpHLm - tpHLn|
Table 8: Capacitive Characteristics
Test Condition
Value
Symbol
Parameter
CIN Input Capacitance
CI/O
Output
Capacitance
CPD Power Dissipation
Capacitance
(note 1)
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
4 10
10
10 pF
8
pF
21
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/8 (per circuit)
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