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

The 5T940 generates a high precision FEC (Forward Error Correction)or non-FEC source clock for SONET/SDH systems as well as asource clock for Gigabit Ethernet systems. This device also has clockregeneration capability: it creates a "clean" version of the clock input byusing the internal oscillator to square the input clock's rising and fallingedges and remove jitter. In the event that the main clock input fails, thedevice automatically locks to a backup reference clock using a hitlessswitchover mechanism.This device detects loss of valid CLKIN and leaves the VCO of the PLL atthe last valid frequency while an alternate input REFIN is selected. If CLKINand REFIN are different frequencies, the multiplication factor will be adjusted toretain the same output frequency.The 5T940 can act as a translator from a differential LVPECL, LVDS, orsingle-ended LVTTL input to LVPECL or LVDS outputs. The 5T940-10has LVDS outputs and the 5T940-30 has LVPECL outputs.The three modes of output frequency range are controlled by the SELmode,which is a 3-level pin. When SELmode is high or low, the QOUT is a multipliedversion of the input clock while QREG is a regenerated version of the input clock.When SELmode is mid, the QOUT is a multiplied version of the input clock whileQREG is QOUT/4.The 5T940 features a selectable loop bandwidth.The 5T940 features a selectable loop bandwidth.


  • Input frequency:- For SONET non-FEC: 19.44MHz, 38.88MHz, 77.76MHz, 155.52MHz,311.04MHz, or 622.08MHz- For SONET FEC: 20.83MHz, 41.66MHz, 83.31MHz, 166.63MHz,333.26MHz, or 666.52MHz
  • - For 10GE copper: 19.53MHz, 39.06MHz, 78.125MHz, 156.25MHz,312.5MHz, or 625MHz
  • - For 10GE optical: 20.14MHz, 40.28MHz, 80.56MHz, 161.13MHz,322.26MHz, or 644.53MHz
  • 3-level inputs for feedback divide ratio and output frequency rangeselection
  • 1x, 2x, 4x, 8x, 16x, and 32x outputs on QOUT
  • Regenerated input clock or QOUT/4 on QREG
  • Lock indicator
  • Power-down modeLVPECL or LVDS outputs
  • Three modes of output frequency range- Mode 0: QOUT range 155.5 - 166.6MHz. QREG is a regenerated versionof the input clock.- Mode 1: QOUT range 622 - 666.5MHz. QREG output 155.5-166.6MHz.- Mode 2: QOUT range 622 - 666.5MHz. QREG is a regenerated version- Mode 2: QOUT range 622 - 666.5MHz. QREG is a regenerated versionof the input clock frequency.
  • Selectable loop bandwidths
  • Hitless switchover
  • Differential LVPECL, LVDS, or single-ended LVTTL input interface


下单器件 ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete VFQFPN 28 I 是的 Tray
Obsolete VFQFPN 28 I 是的 Tray
Obsolete VFQFPN 28 I 是的 Reel


文档标题 其他语言 类型 文档格式 文件大小 日期
应用指南 &白皮书
AN-828 Termination - LVPECL 应用文档 PDF 322 KB
AN-831 The Crystal Load curve 应用文档 PDF 395 KB
AN-846 Termination - LVDS 应用文档 PDF 133 KB
AN-844 Termination - AC Coupling Clock Receivers 应用文档 PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection 应用文档 PDF 495 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products 应用文档 PDF 128 KB
AN-840 Jitter Specifications for Timing Signals 应用文档 PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations 应用文档 PDF 115 KB
AN-839 RMS Phase Jitter 应用文档 PDF 233 KB
AN-833 Differential Input Self Oscillation Prevention 应用文档 PDF 180 KB
AN-834 Hot-Swap Recommendations 应用文档 PDF 153 KB
AN-832 Timing Budget and Accuracy 应用文档 PDF 131 KB
AN-836 Differential Input to Accept Single-ended Levels 应用文档 PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced 应用文档 PDF 160 KB
AN-830 Quartz Crystal Drive Level 应用文档 PDF 143 KB
AN-827 Application Relevance of Clock Jitter 应用文档 PDF 1.15 MB
AN-815 Understanding Jitter Units 应用文档 PDF 565 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance 应用文档 PDF 136 KB
AN-801 Crystal-High Drive Level 应用文档 PDF 202 KB
AN-806 Power Supply Noise Rejection 应用文档 PDF 438 KB
AN-805 Recommended Ferrite Beads 应用文档 PDF 121 KB
PCN# : TB1311-01 New Carrier Tape on VFQFPN-28, VFQFPN-40, VFQFPN-48 产品变更通告 PDF 790 KB
PDN# : CQ-13-02 Q2FY14 Quarter PDN for Manufacturing Discontinuance 产品停产通告 PDF 327 KB
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w 产品变更通告 PDF 24 KB
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products 产品变更通告 PDF 80 KB
PCN#: L-0405-04 To comply with current EIA Std 产品变更通告 PDF 143 KB
PCN#: A-0310-01, Green Products 产品变更通告 PDF 26 KB