74VHC244(2005) データシートの表示（PDF） - Fairchild Semiconductor
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74VHC244 Datasheet PDF : 8 Pages
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AC Electrical Characteristics
Symbol
Parameter
VCC
TA 25qC
TA 40qC to 85qC
Units
(V)
Min
Typ
Max
Min
Max
Conditions
tPLH
Propagation Delay
tPHL
Time
tPZL
3-STATE Output
tPZH
Enable Time
tPLZ
tPHZ
tOSLH
tOSHL
3-STATE Output
Disable Time
Output to Output
Skew
3.3 r 0.3
5.0 r 0.5
3.3 r 0.3
5.0 r 0.5
3.3 r 0.3
5.0 r 0.5
3.3 r 0.3
5.0 r 0.5
5.8
8.4
1.0
10.0
ns
8.3
11.9
1.0
13.5
CL 15 pF
CL 50 pF
3.9
5.5
1.0
5.4
7.5
1.0
6.5
ns
8.5
CL 15 pF
CL 50 pF
6.6
10.6
1.0
12.5
ns
CL 15 pF
9.1
14.1
4.7
7.3
1.0
1.0
16.0
8.5
ns
RL
1 k: CL
CL
50 pF
15 pF
6.2
9.3
1.0
10.5
CL 50 pF
10.3
14.0
6.7
9.2
1.0
1.0
16.0
10.5
ns
RL
1 k: CL
CL
50 pF
50 pF
1.5
1.5
ns (Note 4) CL 50 pF
1.0
1.0
CL 50 pF
CIN
Input Capacitance
4
10
10
pF VCC Open
COUT
Output Capacitance
6
pF VCC 5.0V
CPD
Power Dissipation Capacitance
19
Note 4: Parameter guaranteed by design. tOSLH |tPLHmax tPLHmin|; tOSHL |tPHLmax tPHLmin|.
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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