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參數(shù)資料
| 型號(hào)： | MT9044 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | T1/E1/OC3 System Synchronizer(T1/E1/OC3 系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）) |
| 中文描述： | T1/E1/OC3系統(tǒng)同步器（T1/E1/OC3系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）） |
| 文件頁(yè)數(shù)： | 18/34頁(yè) |
| 文件大?。?/td> | 150K |
| 代理商： | MT9044 |
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18
MT9044
Reset Circuit
A simple power up reset circuit with about a 50us
reset low time is shown in Figure 14. Resistor R
P
is
for protection only and limits current into the RST pin
during power down conditions. The reset low time is
not critical but should be greater than 300ns.
Figure 14 - Power-Up Reset Circuit
Dual T1 Reference Sources with MT9044 in
Automatic Control
For systems requiring simple state machine control,
the application circuit shown in Figure 15 using
Automatic Control may be used.
In this circuit, the MT9044 is operating Automatically,
using a Guard Time Circuit, and the LOS1 and LOS2
inputs to determine all mode changes. Since the
Guard Time Circuit is set to about 1s, all line
interruptions (LOS1=1) less than 1s will cause the
MT9044 to go from Primary Normal Mode to
Holdover Mode and not switch references. For line
interruptions greater than 1s, the MT9044 will switch
Modes
from
Holdover
provided that the secondary signal is valid (LOS2=0).
After receiving a good primary signal (LOS1=0), the
MT9044 will switch back to Primary Normal Mode
For complete Automatic Control state machine
details, refer to Table 5 for the State Table, and
Figure 8 for the State Diagram.
to
Secondary
Normal,
+5V
RST
R
P
1k
C
10nF
R
10k
MT9044
Figure 15 - Dual T1 Reference Sources with MT9044 in 1.544MHz Automatic Control
1k
1k
10nF
To
TX Line
XFMR
MT8985
STo0
STi0
STo1
STi1
F0i
C4i
MT9044
F0o
C4o
FS1
FS2
GTo
GTi
PRI
SEC
LOS1
LOS2
OSCi
MS1
MS2
RSEL
To
RX Line
XFMR
To Line 1
Out
20MHz
±
32ppm
MT9074
To
TX Line
XFMR
DSTo
DSTi
F0i
C4i
TTIP
TRING
RTIP
RRING
LOS
E1.5o
To
RX Line
XFMR
To Line 2
10uF
150k
RST
TRST
10k
+
MT9074
DSTo
DSTi
F0i
C4i
TTIP
TRING
RTIP
RRING
LOS
E1.5o
CLOCK
1k
+ 5V
+ 5V
+ 5V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MT9044AL | 制造商:Microsemi Corporation 功能描述:FRAMER E1/OC3/T1 5V 44MQFP - Trays 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1/OC3/T1 5V 44MQFP - Trays |
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| MT9044AP | 制造商:Microsemi Corporation 功能描述: |
| MT9044AP1 | 制造商:Microsemi Corporation 功能描述:FRAMER E1/OC3/T1 5V 44PLCC - Rail/Tube 制造商:Microsemi Corporation 功能描述:T1/E1/OC3 SYSTEM SYNCHRONIZER 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SYNCHRONIZER T1/E1 44PLCC 制造商:Microsemi Corporation 功能描述:IC SYNCHRONIZER T1/E1 44PLCC |
| MT9044APR1 | 制造商:Microsemi Corporation 功能描述:FRAMER E1/OC3/T1 5V 44PLCC - Tape and Reel 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1/OC3/T1 5V 44PLCC - Tape and Reel |
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