The 840031I is an IEEE 1394b Clock Generator and a member of the HiPerClocksTM family of high performance devices from ICS. The 840031I uses a 24.576MHz crystal to synthesize 98.304MHz. The 840031I has excellent phase jitter performance, from 12KHz – 20MHz integration range. The 840031I is packaged in a small 8-pin SOIC, making it ideal for use in systems with limited board space.


  • 1 LVCMOS/LVTTL output
  • Crystal oscillator interface designed for a 24.576MHz, 18pF parallel resonant crystal
  • Output frequency: 98.304MHz (typical)
  • VCO range: 490MHz to 640MHz
  • RMS phase jitter @ 98.304MHz, using a 24.576MHz crystal, (12KHz - 20MHz): 0.75ps (typical)
  • RMS phase noise at 98.304MHz (typical
  • Offset Noise Power
  • 100Hz ..............-103.3 dBc/Hz
  • 1KHz ..............-126.2 dBc/Hz
  • 10KHz ..............-134.2 dBc/Hz
  • 100KHz ..............-132.9 dBc/Hz
  • 3.3V core/1.8V output operating supply
  • Lead-Free fully RoHS compliant
  • -40°C to 85°C ambient operating temperature

Product Options

Orderable Part ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete SOIC 8 I Yes Tube

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-845 Termination - LVCMOS Application Note PDF 146 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-837 Overdriving the Crystal Interface Application Note PDF 133 KB
AN-832 Timing Budget and Accuracy Application Note PDF 131 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
840031I IBIS Model Model - IBIS ZIP 34 KB