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Clock Generator for Broadcom Processor

The IDT8V49N231I is a high-performance PLL-based clock generator designed to interface with Broadcom XLP2xxx processors. The IDT8V49N231I has one 25MHz crystal input to generate output frequencies to support XLP Core/DDR3, USB, SGMII/XAUI and PCIe reference clocks in a single chip. The IDT8V49N231I low jitter VCO easily meets PCI Express Gen 1, 2 and 3 requirements.
Excellent phase noise performance is maintained with IDT’s Fourth Generation FemtoClock® NG technology.


  • Fourth Generation FemtoClock® NG PLL technology
  • Eleven outputs to support 133.33MHz/66.66MHz, 100MHz, 125MHz for core/DDR3, USB, SGMII/XAUI and PCIe reference clocks
  • Two 1.8V LVCMOS clock outputs for core/DDR3 at 133.33MHz or 66.66MHz
  • One LVDS clock output for USB at 100MHz
  • Three LVDS clock outputs for SGMII/XAUI at 125MHz
  • Five HCSL clock outputs for PCIe at 100MHz
  • Crystal oscillator interface designed for 25MHz, parallel resonant crystal such as the IDT 603-25-173 (25 MHz)
  • PCI Express Gen 1 (2.5Gb/s), Gen 2 (5Gb/s) and Gen 3 (8Gb/s) jitter compliant
  • Power supply modes:
    Core / Output
    3.3V / 3.3V (HCSL, LVDS outputs)
    3.3V / 1.8V (LVCMOS outputs only)
  • Lead-free (RoHS 6) packaging
  • -40°C to 85°C ambient operating temperature

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Phase Jitter Typ RMS (ps)App Jitter ComplianceChipset ManufacturerChipset Name
11LVDS, HCSL, LVCMOS66.660000 - 133.33000025.0000001Crystal30.250PCIe Gen2, PCIe Gen3, PCIe Gen1BroadcomXLP2xxx

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8V49N231NLGIActiveNLG56P3VFQFPN56IYesTrayCheck Availability
8V49N231NLGI8ActiveNLG56P3VFQFPN56IYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
8V49N231 Datasheet Datasheet PDF 501 KB Aug 6, 2015
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
show all (16)
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 8, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014