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Número de pieza
componentes Descripción
DM74AS646NT Ver la hoja de datos (PDF) - Fairchild Semiconductor
Número de pieza
componentes Descripción
Fabricante
DM74AS646NT
Octal Bus Transceiver and Register
Fairchild Semiconductor
DM74AS646NT Datasheet PDF : 8 Pages
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DM74AS646 Switching Characteristics
Symbol
Parameter
Conditions
From
(Input)
To
Min
(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
CBA or CAB
90
2
A or B
2
t
PLH
Propagation Delay Time
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
HIGH-to-LOW Level Output
A or B
2
B or A
1
t
PLH
Propagation Delay Time
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
HIGH-to-LOW Level Output
SBA or SAB
(Note 6)
2
A or B
2
t
PZH
Output Enable Time
2
to HIGH Level Output
t
PZL
Output Enable Time
to LOW Level Output
t
PHZ
Output Disable Time
from HIGH Level Output
Enable G
3
A or B
2
t
PLZ
Output Disable Time
2
from LOW Level Output
t
PZH
Output Enable Time
3
to HIGH Level Output
t
PZL
Output Enable Time
to LOW Level Output
t
PHZ
Output Disable Time
from HIGH Level Output
3
DIR
A or B
2
t
PLZ
Output Disable Time
2
from LOW Level Output
Note 6:
These parameters are measured with the internal output state of the storage register opposite to that of the bus input.
Max
8.5
9
9
7
11
9
9
14
9
9
16
18
10
10
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5
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