NOTICE - The following device(s) are recommended alternatives:

The 843002I-41 is a PLL based synchronous clock generator that is optimized for SONET/SDH line card applications where jitter attenuation and frequency translation is needed. The device contains two internal PLL stages that are cascaded in series. The first PLL stage uses a VCXO which is optimized to provide reference clock jitter attenuation and to be jitter tolerant, and to provide a stable reference clock for the 2nd PLL stage (typically 19.44MHz). The second PLL stage provides additional frequency multiplication (x32), and it maintains low output jitter by using a low phase noise FemtoClock® VCO. PLL multiplication ratios are selected from internal lookup tables using device input selection pins. The device performance and the PLL multiplication ratios are optimized to support non-FEC (non-Forward Error Correction) SONET/SDH applications with rates up to OC-48 (SONET) or STM-16 (SDH). The VCXO requires the use of an external, inexpensive pullable crystal. VCXO PLL uses external passive loop filter components which are used to optimize the PLL loop bandwidth and damping characteristics for the given line card application.

The 843002I-41 includes two clock input ports. Each one can accept either a single-ended or differential input. Each input port also includes an activity detector circuit, which reports input clock activity through the LOR0 and LOR1 logic output pins. The two input ports feed an input selection mux. "Hitless switching" is accomplished through proper filter tuning. Jitter transfer and wander characteristics are influenced by loop filter tuning, and phase transient performance is influenced by both loop filter tuning and alignment error between the two reference clocks.

Typical 843002I-41 configuration in SONET/SDH Systems:

  • VCXO 19.44MHz crystal
  • Input Reference clock frequency selections:
    19.44MHz, 38.88MHz, 77.76MHz, 155.52MHz, 311.04MHz, 622.08MHz
  • Output clock frequency selections:
    19.44MHz, 77.76MHz, 155.52MHz, 311.04MHz, 622.08MHz, Hi-Z


  • Two Differential LVPECL outputs
  • Selectable CLKx, nCLKx differential input pairs
  • CLKx, nCLKx pairs can accept the following differential input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL or single-ended LVCMOS or LVTTL levels
  • Maximum output frequency: 700MHz
  • FemtoClock VCO frequency range: 560MHz - 700MHz
  • RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal (12kHz to 20MHz): 0.81ps (typical)
  • Full 3.3V or mixed 3.3V core/2.5V output operating supply
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package


製品名 Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type 購入/サンプル
Obsolete VFQFPN 32 I はい Tray
Obsolete VFQFPN 32 I はい Reel


タイトル language 分類 形式 サイズ 日付
star 843002I-41 Datasheet データシート PDF 442 KB
AN-828 Termination - LVPECL アプリケーションノート PDF 322 KB
AN-841 Pullable Crystal Selection and VCXO Tuning アプリケーションノート PDF 334 KB
AN-831 The Crystal Load curve アプリケーションノート PDF 395 KB
AN-848 VCXO - Crystal Selection アプリケーションノート PDF 222 KB
AN-849 Loop Filter Component Selection for VCXO Based PLLs アプリケーションノート PDF 218 KB
AN-847 VCXO - Absolute Pull Range アプリケーションノート PDF 155 KB
AN-842 Thermal Considerations in Package Design and Selection アプリケーションノート PDF 495 KB
AN-840 Jitter Specifications for Timing Signals アプリケーションノート PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations アプリケーションノート PDF 115 KB
AN-839 RMS Phase Jitter アプリケーションノート PDF 233 KB
AN-835 Differential Input with VCMR being VIH Referenced アプリケーションノート PDF 160 KB
AN-836 Differential Input to Accept Single-ended Levels アプリケーションノート PDF 120 KB
AN-830 Quartz Crystal Drive Level アプリケーションノート PDF 143 KB
AN-815 Understanding Jitter Units アプリケーションノート PDF 565 KB
AN-827 Application Relevance of Clock Jitter アプリケーションノート PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance アプリケーションノート PDF 136 KB
AN-801 Crystal-High Drive Level アプリケーションノート PDF 202 KB
AN-805 Recommended Ferrite Beads アプリケーションノート PDF 121 KB
AN-806 Power Supply Noise Rejection アプリケーションノート PDF 438 KB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility 製品変更通知 PDF 983 KB
PDN# : CQ-19-01(R1) Quarterly Market Declined PDN 製品中止通知 PDF 1014 KB
PDN# : CQ-19-01 Quarterly Market Declined PDN 製品中止通知 PDF 537 KB
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location 製品変更通知 PDF 583 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location 製品変更通知 PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location 製品変更通知 PDF 544 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products 製品変更通知 PDF 361 KB
IDT Clock Generation Overview (Japanese) English 概要 PDF 2.19 MB


タイトル language 分類 形式 サイズ 日付
843002I-41 IBIS Model モデル-IBIS ZIP 64 KB