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零件编号
产品描述 (功能)
DM74AS648WMX 查看數據表(PDF) - Fairchild Semiconductor
零件编号
产品描述 (功能)
生产厂家
DM74AS648WMX
Octal Bus Transceiver and Register
Fairchild Semiconductor
DM74AS648WMX Datasheet PDF : 8 Pages
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DM74AS648 Switching Characteristics
Symbol
Parameter
Conditions
From
(Input)
To
(Output)
f
MAX
t
PLH
t
PHL
Maximum Clock Frequency
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
V
CC
=
4.5V to 5.5V,
R
1
=
R
2
=
500
Ω
C
L
=
50 pF
CAB or CBA
A or B
t
PLH
Propagation Delay Time
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
HIGH-to-LOW Level Output
A or B
B or A
t
PLH
Propagation Delay Time
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
HIGH-to-LOW Level Output
SBA or SAB
(Note 7)
A or B
t
PZH
Output Enable Time
to HIGH Level Output
t
PZL
Output Enable Time
to LOW Level Output
t
PHZ
Output Disable Time
from HIGH Level Output
Enable G
A or B
t
PLZ
Output Disable Time
from LOW Level Output
t
PZH
Output Enable Time
to HIGH Level Output
t
PZL
Output Enable Time
to LOW Level Output
t
PHZ
Output Disable Time
from HIGH Level Output
DIR
A or B
t
PLZ
Output Disable Time
from LOW Level Output
Note 7:
These parameters are measured with the internal output state of the storage register opposite to that of the bus input.
Min
Max
90
2
8.5
2
9
2
8
1
7
2
11
2
9
2
9
3
15
2
9
2
9
3
16
3
18
2
10
2
10
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
www.fairchildsemi.com
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