参数资料
型号: SM3E-19.44M
厂商: Connor-Winfield
文件页数: 18/36页
文件大小: 0K
描述: IC MOD TIMING 19.440MHZ STRAT 3E
标准包装: 1
系列: SM3
类型: 定时模块,系统时钟
PLL:
主要目的: 以太网,ADM,DSLAM,SONET/SDH,Stratum,TDM
输入: LVCMOS
输出: LVCMOS
电路数: 1
比率 - 输入:输出: 8:3
差分 - 输入:输出: 无/无
频率 - 最大: 19.44MHz
电源电压: 3.135 V ~ 3.465 V
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 32-DIP 模块
包装: 管件
其它名称: CW643
SM3E 19.44M
SM3E19.44M
SM3E Data Sheet #:
TM054
Page 25 of 36 Rev: 04 Date: 01/26/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
Application Notes
AvailableOutput1frequenciesare:12.96MHz,19.44MHz,25.92MHz,38.88MHz,51.84MHzor77.76MHz.Afterthemoduleis
poweredup,pulltheresetpinlowfor10ms.Wait1200msandreadthecontentsofregister0x33.Ifitreads1thenthemodulecame
upproperly.Ifitreads0thenresetthemoduleandre-readregister0c33after1200ms.Thecontentsof0x33mustread1beforeusing
themodule.
Reference Inputs–Theapplicationmaysupplyupto8referenceinputs,appliedatinputpinsRef1 - 8.Theymayeachbe8
kHz,1.544MHz,2.048MHz,12.96MHz,19.44MHz,25.92MHz,38.88MHz,51.84MHzor77.76MHz.Thedeviceauto-detectsthe
referencefrequencies,andtheymaybereadfromtheRef(1-8)_Frq_Priorityregistersinregistercontrolmode,asdescribedinthe
controlmodesectionsthatfollow.
Referenceswitchesareperformedinahitlessmanner.However,iftheapplicationexternallychangesthefrequencyofaparticular
reference,thedevicerequires20mstoauto-detectthenewfrequency.Manualswitchestoafrequencychangedreferenceshouldnot
bemadeduringthisinterval.Automaticreferenceselectionmodeaccountsfortheauto-detectioninthereferencequalification.
Referenceswouldtypically(butneednotbe)connectedindecreasingorderofusagepriority.ForexampleifredundantBITSclocks
areavailable,theywouldtypicallybeassignedto
Ref1 andRef2,withothertransmissionderivedsignalsfollowingthereafter.
Master/Slave operation–Forsomeapplications,reliabilityrequirementsmaydemandthattheclocksystembeduplicated.The
SM3Edevicewillsupportthemaster/slaveduplicatedconfigurationforsuchapplications.Tofacilitateit’suse,thedeviceincludesthe
necessarysignalcrosscouplingandcontrolfunctions.Redundancyforreliabilityimpliestwomajorconsiderations:1)Maintaining
separatefailuregroupssuchthatafailureinonegroupdoesnotaffectit’smate,and2)Physicalandlogicalpartitioningforrepair,
suchthatafailedcomponentcanbereplacedwhilethemateremainsinservice,ifsodesired.Systemdesignneedstoaccountto
meetsystemlevelgoals.
Master / Slave Configuration
Figure 8
STC3500
SM3E
8 kHz
M/S
Reference 8 In
Reference 1 In
2
SM3E
1
M/S (8KHz)
8 kHz
Synchronized clock output
Ref1
Ref8
Ref1
Ref8
M/S Output
Output 1
BITS_Clk
Output 1
Sync_8K
BITS_Clk
BITS c lock output
BITS clock output
(8KHz)
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