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

The 84427 is a Crystal-to-LVDS Frequency Synthesizer/Fanout Buffer. The output frequency can be programmed using the frequency select pins. The low phase noise characteristics of the 84427 make it an ideal clock source for 10 Gigabit Ethernet, 10 Gigabit Fibre Channel, OC3 and OC12 applications.


  • Six LVDS outputs
  • Crystal oscillator interface
  • Output frequency range: 77.76MHz to 625MHz
  • Crystal input frequency: 19.44MHz, 25MHz or 25.5MHz
  • RMS phase jitter at 155.52MHz, using a 19.44MHz crystal (12kHz to 20MHz): 3.4ps (typical)
    Phase noise:
    Offset                    Noise Power
      100Hz ............... -95 dBc/Hz
        1kHz ............... -110 dBc/Hz
      10kHz ............... -120 dBc/Hz
    100kHz ............... -121 dBc/Hz
  • 3.3V supply voltage
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free RoHS-compliant package

tuneProduct Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete SOIC 24 C Yes Tube
Obsolete SOIC 24 C Yes Reel


Title language Type Format File Size Date
Datasheets & Errata
star 84427 Datasheet Datasheet PDF 293 KB
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-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 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-832 Timing Budget and Accuracy Application Note PDF 131 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-837 Overdriving the Crystal Interface Application Note PDF 133 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products Application Note PDF 108 KB
PDN# : CQ-15-03 Quarter PDN for Declined Market Product Discontinuation Notice PDF 542 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB

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