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參數(shù)資料
| 型號： | HD26LS31 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 73K |
| 代理商： | HD26LS31 |
HD26LS31
12
A feature of termination implemented as shown in figure 9 is that power dissipation is low when the duty of
the transmitted signal is high.
However, care is required, since if R
T
is sufficiently small, when the output on the pulled-up side goes low,
since the inverter transistor (Q
4
in figure 2) has no protection circuit, and so a large current will flow and
the output low level will rise.
Figure 10 shows the output voltage characteristics when termination resistance R
T
is varied.
With the method of using the driver described above, if termination resistance R
T
becomes sufficiently
small, the region within which the output current limiter circuit operates will be entered, as can be seen
from the I
OH
vs. V
OH
characteristics shown in figure 3. In this region, the output stage power dissipation is
large and the output voltage changes abruptly. A measure such as insertion of a capacitor in series with the
termination resistance is therefore necessary. Consequently, when selecting the transmission line, the
circuit termination resistance to be used requires careful consideration.
5
2
1.0
0.5
0.2
0.1
0.05
10
20
50
100 200
Termination Resistance R
T
(
)
500 1 k
2 k
5 k 10 k 20 k
50 k
O
O
,
O
(
V
OH
(Y)
V
OL
(Z)
V
= 5 V
Ta = 25
°
C
Z
"H"
V
OH
GND
R
T
V
OL
Y
Figure 8 Termination Resistance vs. Output Voltage Characteristics
V
CC
R
T
R
T
Z
Y
Data input
Figure 9 Example of Driver Use-3
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