74AC646SCX(1998) 查看數據表（PDF） - Fairchild Semiconductor
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74AC646SCX Datasheet PDF : 10 Pages
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AC Electrical Characteristics for AC (Continued)
Symbol
Parameter
tPZL
Enable Time
G to An or Bn
tPHZ
Disable Time
G to An or Bn
tPLZ
Disable Time
G to An or Bn
tPZH
Enable Time
DIR to An or Bn
tPZL
Enable Time
DIR to An or Bn
tPHZ
Disable Time
DIR to An or Bn
tPLZ
Disable Time
DIR to An or Bn
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 8)
Min
3.3
2.5
5.0
1.5
3.3
3.0
5.0
2.0
3.3
2.0
5.0
1.5
3.3
2.0
5.0
1.5
3.3
2.5
5.0
1.5
3.3
2.5
5.0
1.5
3.3
1.5
5.0
1.5
AC Operating Requirements for AC
Symbol
Parameter
tS
Setup Time, HIGH or LOW
Bus to Clock
tH
Hold Time, HIGH or LOW
Bus to Clock
tW
Clock Pulse Width
HIGH or LOW
Note 9: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 9)
3.3
5.0
3.3
5.0
3.3
5.0
TA = +25°C
CL = 50 pF
Typ
7.5
5.5
8.0
6.5
7.5
6.0
6.5
5.0
7.0
5.0
7.5
5.5
7.5
5.5
Max
12.5
9.0
12.5
10.0
12.0
9.5
11.0
7.5
11.5
8.0
11.5
9.5
12.0
9.5
TA = −40°C to +85°C
CL = 50 pF
Min
Max
2.0
14.0
1.5
10.0
2.5
13.5
2.0
11.0
2.0
13.5
1.5
10.5
1.5
12.0
1.0
8.5
2.0
13.0
1.0
9.0
1.5
12.5
1.5
10.0
1.5
13.5
1.5
10.5
TA = +25°C
TA = −40°C to +85°C
CL = 50 pF
CL = 50 pF
Typ
Guaranteed Minimum
2.0
5.0
5.5
1.5
4.0
4.5
−1.5
0
0
−0.5
0.5
1.0
2.0
3.5
4.5
2.0
3.5
3.5
Units
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Units
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