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參數(shù)資料
| 型號： | PT7A4410J |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | T1/E1/OC3 System Synchronizer |
| 中文描述： | T1/E1/OC3系統(tǒng)同步 |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 294K |
| 代理商： | PT7A4410J |
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Data Sheet
PT7A4410/4410L
T1/E1/OC3 System Synchronizer
PT0106(09/02)
Ver:0
15
A simple way to control the Guard Time is shown in Figure 11.
The Guard Time can be calculated as follows:
V
t
= RC x ln ( )
RC x 0.6
V
CC
- V
SIH
*
V
is the logic high going threshold for the GTi Schmitt Trigger
input, see DC Electrical Characteristics.
Figure 11. Symmetrical Guard Time Circuit
In cases where fast toggling of the LOS1 input might be ex-
pected, an unsymmetrical Guard Time Circuit is recommended
as shown in Figure 12. This setting ensures that reference
switching does not occur until the entire guard time has ex-
pired. The timing diagram is shown in Figure 13.
Figure 12. Unsymmetrical Guard Time Circuit
Figure 13. Timing Example of Unsymmetrical Guard Time Circuit in Automatic Mode
Good
Good
Good
Good
Bad
Bad
T
D
T
D
V
SIH
PRI
Normal
PRI
Holdover
SEC
Normal
PRI
Normal
PRI
Normal
PRI
Holdover
SEC
Signal
Status
LOS2
PRI
Signal
Status
LOS1
GTo
GTi
State
PT7A4410/4410L
GTi
GTo
R
150k
R
P
1k
C
10
μ
F
+
PT7A4410/4410L
GTi
GTo
R
C
150k
R
P
1k
C
10
μ
F
+
R
D
1k
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