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

The 5T929 generates a high precision FEC (Forward Error Correction) or non-FEC source clock for SONET/SDH systems as well as a source clock for Gigabit Ethernet systems. This device also has clock regeneration capability: it creates a "clean" version of the clock input by using the internal oscillator to square the input clock's rising and falling edges and remove jitter. In the event that the main clock input fails, the device automatically locks to a backup reference clock using a hitless switchover mechanism. This device detects loss of valid CLKIN and leaves the VCO of the PLL at the last valid frequency while an alternate input REFIN is selected. If CLKIN and REFIN are different frequencies, the multiplication factor will be adjusted to retain the same output frequency. The 5T929 can act as a translator from a differential LVPECL, LVDS, or single-ended LVTTL input to LVPECL or LVDS outputs. The 5T929-10 has LVDS outputs and the 5T929-30 has LVPECL outputs. The two modes of output frequency range are controlled by the SELmode. When SELmode is high or low, the QOUT is a multiplied version of the input clock while QREG is a regenerated version of the input clock.


  • 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
  • Output frequency range selection
  • 1x, 2x, 4x, 8x, 16x, and 32x outputs on QOUT
  • Regenerated input clock on QREG
  • Lock indicator
  • Power-down mode
  • LVPECL or LVDS outputs
  • Two modes of output frequency range
  • Mode 0: QOUT range 155.5 - 166.6MHz. QREG is a regenerated version of the input clock.
  • Mode 1: QOUT range 622 - 666.5MHz. QREG is a regenerated version of the input clock frequency.
  • Hitless switchover
  • Differential LVPECL, LVDS, or single-ended LVTTL input interface
  • 2.375 - 3.465V core and I/O

Product Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete VFQFPN 28 I Yes Tray
Obsolete VFQFPN 28 I Yes Tray

Documentation & Downloads

Title Other Languages Type Format File Size Date
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-846 Termination - LVDS Application Note PDF 133 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 128 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-832 Timing Budget and Accuracy Application Note PDF 131 KB
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 180 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 160 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PDN# : CQ-13-02 (R1) PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 601 KB
PDN# : CQ-13-02 Q2FY14 Quarter PDN for Manufacturing Discontinuance Product Discontinuation Notice PDF 327 KB
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB
PCN# : TB0609-03R2 PIN 1 ORIENTATION IN TAPE & REEL CHANGE Product Change Notice PDF 376 KB
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB
PCN#: L-0405-04 To comply with current EIA Std Product Change Notice PDF 143 KB
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB