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參數(shù)資料
| 型號： | ZL30101QDG1 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | T1/E1 Stratum 3 System Synchronizer |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1 MM HEIGHT, LEAD FREE, MS-026ACD, TQFP-64 |
| 文件頁數(shù)： | 12/35頁 |
| 文件大?。?/td> | 328K |
| 代理商： | ZL30101QDG1 |
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ZL30101
Data Sheet
12
Zarlink Semiconductor Inc.
Figure 3 - Reference Monitor Circuit
Exceeding the thresholds of any of the monitors forces the corresponding REF_FAIL pin to go high. The single
cycle and coarse frequency failure flags force the DPLL into Holdover mode and feed a timer that disqualifies the
reference input signal when the failures are present for more than 2.5 s. The single cycle and coarse frequency
failures must be absent for 10 s to let the timer requalify the input reference signal as valid. Multiple failures of less
than 2.5 s each have an accumulative effect and will disqualify the reference eventually. This is illustrated in Figure
4.
Figure 4 - Behaviour of the Dis/Requalify Timer
When the incoming signal returns to normal (REF_FAIL=0), the DPLL returns to Normal mode with the output
signal locked to the input signal. Each of the monitors has a built-in hysteresis to prevent flickering of the REF_FAIL
status pin at the threshold boundaries. The precise frequency monitor and the timer do not affect the mode
(Holdover/Normal) of the DPLL.
Reference Frequency
Detector
Single Cycle
Monitor
Precise Frequency
Monitor
Coarse Frequency
Monitor
dis/requalify
timer
REF0 /
REF1
OR
OR
REF_DIS= reference disrupted.
This is an internal signal.
Mode select
state machine
HOLDOVER
REF_DIS
REF_FAIL0 /
REF_FAIL1
2.5 s
10 s
current REF
timer
REF_FAIL
SCM or CFM failure
HOLDOVER
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PDF描述 |
|---|---|
| ZL30101 | T1/E1 Stratum 3 System Synchronizer |
| ZL30101QDC | T1/E1 Stratum 3 System Synchronizer |
| ZL30102QDG1 | T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110 |
| ZL30102 | T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110 |
| ZL30102QDG | T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL30102 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110 |
| ZL30102_05 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110 |
| ZL30102QDG | 制造商:Zarlink Semiconductor Inc 功能描述:PLL CLOCK SYNTHESIZER SGL 64TQFP - Trays |
| ZL30102QDG1 | 制造商:Microsemi Corporation 功能描述:PB FREE T1/E1 SYSTEM SYNCHRONIZER - Trays 制造商:Zarlink Semiconductor Inc 功能描述:PB FREE T1/E1 SYSTEM SYNCHRONIZER - Trays |
| ZL30105 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1/SDH Stratum 3 Redundant System Clock Synchonizer for AdvancedTCA and H.110 |
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