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常用芯片数据手册ics2509c.pdf

发布：2024-05-13约2.32万字共7页下载文档

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Integrated

Circuit

ICS250

Systems,.

3.3VPhase-LockLoopClockDriver

GeneralDescriptionFeatures

TheICS2509Cisahighperformance,lowskew,lowjitter•MeetsorexceedsPC133DIMM

clockdriver.Itusesaphaselockloop(PLL)technologytospecification1.1

align,inbothphaseandfrequency,theCLKINsignalwith•SpreadSpectrumClockCompatible

theCLKOUTsignal.Itisspecificallydesignedforusewith

synchronousSDRAMs.TheICS2509Coperatesat3.3V•Distributesoneclockinputtoonebankoffiveandone

VCCanddrivesuptonineclockloads.bankoffouroutputs

•Separateoutputenable(OEA,OEB)foreachoutput

Onebankoffiveoutputsandonebankoffouroutputsbank

provideninelow-skew,low-jittercopiesofCLKIN.Output•Operatingfrequency25MHzto175Mhz

signaldutycyclesareadjustedto50percent,t

ofthedutycycleatCLKIN.Eachbankofoutputscanbe•Externalfeedbackinput(FBIN)terminalisusedto

enabledordisabledseparayviacontrol(OEAandOEB)synchrionizetheoutputstotheclockinput

inputs.WhentheOEinputsarehigh,theoutputsalignin•NoexternalRworkrequired

phaseandfrequencywithCLKIN;whentheOEinputsare•Operatesat3.3VVcc

low,theoutputsaredisabledtothelogiclowstate.

•stic24-pin173milTSSOPpackage

TheICS2509CdoesnotrequireexternalRCfilter

components.TheloopfilterforthePLLisludedon-chip,

minimizingcomponentcount,boardspace,andcost.The

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