8-output 3.3 V PCIe Gen1-2-3 Clock Generator with Zo=100 ohms

NOTICE - The following device(s) are recommended alternatives:
The 9FGL839 is an 8 output differential synthesizer for PCI Express Gen1, Gen2, and Gen3 applications. It has integrated terminations providing direction connection to 100 ohm transmission lines and saving 32 resistors compared to standard HCSL outputs. The 9FGL839 supports Common, Data and Separate Reference no-Spread (SRnS) PCIe clock architectures.


  • Integrated terminations; save 32 resistors compared to standard HCSL outputs
  • LP-HCSL outputs; support separate VDDIO rail and 130mW typical power consumption
  • 8 OE# pins; Hardware control of each output
  • 25 MHz crystal input; exact synthesis
  • 100 MHz operation; supports PCIe and SATA applications
  • VDDIO; allows outputs to run from lower voltage rail to save power
  • OE# pins have 1.5V high input threshold; direct interface to 1.8-3.3 V systems
  • <130 mW power consumption (typical)
  • Cycle-to-cycle jitter <50 ps
  • Output-to-output skew <100 ps
  • PCIe Gen2 phase jitter <3.0 ps RMS
  • PCIe Gen3 phase jitter <1.0 ps RMS
  • PCIe Gen3 SRnS clock phase jitter <0.7 ps RMS

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
9FGL839AKILF Obsolete NDG48P2 VFQFPN 48 I Yes Tray Availability
9FGL839AKILFT Obsolete NDG48P2 VFQFPN 48 I Yes Reel Availability
9FGL839AKLF Obsolete NDG48P2 VFQFPN 48 C Yes Tray Availability
9FGL839AKLFT Obsolete NDG48P2 VFQFPN 48 C Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
9FGL839 Datasheet Datasheet PDF 158 KB Oct 28, 2015
Application Notes & White Papers
AN-918 Programmable Clocks vs Crystal Oscillators Application Note PDF 221 KB Mar 9, 2016
AN-891 Driving LVPECL, LVDS, CML, and SSTL Logic with IDT's "Universal" Low-Power HCSL Outputs Application Note PDF 354 KB Dec 10, 2015
AN-879 Low-Power HCSL vs Traditional HCSL Application Note PDF 150 KB Apr 7, 2015
AN-843 PCI Express Reference Clock Requirements Application Note PDF 1.81 MB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 10, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 6, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 6, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 5, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 11, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
AN-808 PCI Express/HCSL Termination Application Note PDF 54 KB Jan 14, 2014
PDN# : CQ-17-04(R1) Product Discontinuance Notice Product Discontinuation Notice PDF 606 KB Nov 29, 2017
PDN# : CQ-17-04 Product Discontinuance Notice Product Discontinuation Notice PDF 599 KB Aug 24, 2017
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location Product Change Notice PDF 583 KB Dec 19, 2016
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 21, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 20, 2015
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 20, 2012
PCI Express® Timing Solutions Overview Overview PDF 301 KB Apr 19, 2018
The IDT Communications Products Advantage Overview PDF 4.00 MB Mar 21, 2018
The IDT Consumer Products Advantage Overview PDF 4.01 MB Jun 30, 2017
The IDT Automotive Advantage 日本語 Overview PDF 3.55 MB May 26, 2017
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016