74VHC74 查看數據表（PDF） - Fairchild Semiconductor
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74VHC74 Datasheet PDF : 8 Pages
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AC Electrical Characteristics
Symbol
Parameter
VCC
TA 25qC
TA 40qC to 85qC
Units
Conditions
(V)
Min
Typ
Max
Min
Max
fMAX
Maximum Clock
Frequency
3.3 r 0.3
80
125
50
75
70
MHz CL 15 pF
45
CL 50 pF
5.0 r 0.5 130
170
90
115
110
MHz CL 15 pF
75
CL 50 pF
tPLH
Propagation Delay
tPHL
Time (CK-Q, Q)
3.3 r 0.3
6.7
11.9
1.0
14.0
ns
CL 15 pF
9.2
15.4
1.0
17.5
CL 50 pF
5.0 r 0.5
4.6
7.3
1.0
8.5
ns
CL 15 pF
6.1
9.3
1.0
10.5
CL 50 pF
tPLH
Propagation Delay Time 3.3 r 0.3
tPHL
(CLR, PR -Q, Q)
7.6
12.3
1.0
14.5
ns
CL 15 pF
10.1
15.8
1.0
18.0
CL 50 pF
5.0 r 0.5
4.8
7.7
1.0
9.0
ns
CL 15 pF
6.3
9.7
1.0
11.0
CL 50 pF
CIN
Input Capacitance
4
10
10
pF VCC Open
CPD
Power Dissipation
25
pF (Note 5)
Capacitance
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 from the equation: ICC (opr.) CPD * VCC * fIN ICC/2 (per F/F).
AC Operating Requirements
Symbol
Parameter
tW(L)
tW(H)
tW(L)
Minimum Pulse Width (CK)
Minimum Pulse Width (CLR, PR)
tS
Minimum Setup Time
tH
Minimum Hold Time
tREC
Minimum Recovery Time (CLR, PR)
Note 6: VCC is 3.3 r 0.3V or 5.0 r 0.5V
VCC
(V)
(Note 6)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
TA 25qC
TA 40qC to 85qC
Typ
Guaranteed Minimum
6.0
7.0
5.0
5.0
6.0
7.0
5.0
5.0
6.0
7.0
5.0
5.0
0.5
0.5
0.5
0.5
5.0
5.0
3.0
3.0
Units
ns
ns
ns
ns
ns
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