參數(shù)資料
型號(hào)： ZL30100QDG1
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： T1/E1 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(yè)數(shù)： 20/36頁(yè)
文件大?。?/td> 346K
代理商： ZL30100QDG1
ZL30100
Data Sheet
20
Zarlink Semiconductor Inc.
Figure 10 - Mode Switching in Normal Mode
4.5 Reference Selection
The active reference input (REF0, REF1) is selected by the REF_SEL pin as shown in Table 5. If the logic value of
the REF_SEL pin is changed when the DPLL is in Normal mode, the ZL30100 will perform a hitless reference
switch.
When the REF_SEL inputs are used to force a change from the currently selected reference to another reference,
the action of the LOCK output will depend on the relative frequency and phase offset of the old and new references.
Where the new reference has enough frequency offset and/or TIE-corrected phase offset to force the output
outside the phase-lock-window, the LOCK output will de-assert, the lock-qualify timer is reset, and LOCK will stay
de-asserted for the full lock-time duration. Where the new reference is close enough in frequency and TIE-
corrected phase for the output to stay within the phase-lock-window, the LOCK output will remain asserted through
the reference-switch process.
REF_SEL
(input pin)
Input Reference Selected
0
REF0
1
REF1
Table 5 - Reference Selection
REF_DIS=1: Current selected reference disrupted (see Figure 3). This is an internal signal.
REF_CH= 1: Reference change, a change in the REF_SEL pin. This is an internal signal.
TIE Correction
(HOLDOVER=1)
Holdover
(HOLDOVER=1)
REF_DIS=0
REF_CH=1
REF_DIS=0 and
REF_CH=0 and
HMS=0
REF_DIS=1
(REF_DIS=0 and HMS=1) or
REF_CH=1
REF_DIS=1
RST
Normal
(HOLDOVER=0)
相關(guān)PDF資料
PDF描述
ZL30100 T1/E1 System Synchronizer
ZL30100QDC T1/E1 System Synchronizer
ZL30101QDG1 T1/E1 Stratum 3 System Synchronizer
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ZL30101QDC T1/E1 Stratum 3 System Synchronizer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL30101 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 Stratum 3 System Synchronizer
ZL30101_06 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 Stratum 3 System Synchronizer
ZL30101QDC 制造商:Microsemi Corporation 功能描述:
ZL30101QDG1 制造商:Microsemi Corporation 功能描述:SYS SYNCHRONIZER 64TQFP - Trays
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
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