74VHC244 查看數據表（PDF） - Fairchild Semiconductor
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74VHC244 Datasheet PDF : 8 Pages
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AC Electrical Characteristics
Symbol
Parameter
VCC
TA = 25°C
TA = −40°C to +85°C
Units
(V)
Min
Typ
Max
Min
Max
Conditions
tPLH
Propagation Delay
tPHL
Time
3.3 ± 0.3
5.0 ± 0.5
5.8
8.4
1.0
8.3
11.9
1.0
3.9
5.5
1.0
5.4
7.5
1.0
tPZL
3-STATE Output
tPZH
Enable Time
3.3 ± 0.3
5.0 ± 0.5
6.6
10.6
1.0
9.1
14.1
1.0
4.7
7.3
1.0
6.2
9.3
1.0
tPLZ
3-STATE Output
3.3 ± 0.3
10.3
14.0
1.0
tPHZ
Disable Time
5.0 ± 0.5
6.7
9.2
1.0
tOSLH
Output to Output
3.3 ± 0.3
1.5
tOSHL
Skew
5.0 ± 0.5
1.0
CIN
Input Capacitance
4
10
COUT
Output Capacitance
6
CPD
Power Dissipation Capacitance
19
Note 4: Parameter guaranteed by design. tOSLH = |tPLHmax − tPLHmin|; tOSHL = |tPHLmax − tPHLmin|.
10.0
ns
13.5
CL = 15 pF
CL = 50 pF
6.5
ns
8.5
CL = 15 pF
CL = 50 pF
12.5
ns RL = 1 kΩ CL = 15 pF
16.0
CL = 50 pF
8.5
ns
10.5
CL = 15 pF
CL = 50 pF
16.0
ns RL = 1 kΩ CL = 50 pF
10.5
CL = 50 pF
1.5
ns (Note 4) CL = 50 pF
1.0
CL = 50 pF
10
pF VCC = Open
pF VCC = 5.0V
pF (Note 5)
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: ICC (OPR.) = CPD * VCC * fIN + ICC/8 (per bit).
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