The 9FGV1008B is a member of IDT's PhiClock™ programmable clock generator family. The 9FGV1008B provides one integer frequency, one copy of a fractional or spread spectrum output frequency, and one copy of the crystal reference input. Two select pins allow for hardware selection of the desired configuration, or two I2C bits allow easy software selection of the desired configuration. The user may configure any one of the four OTP configurations as the default when operating in I2C mode. Four unique I2C addresses are available, allowing easy I2C access to multiple components.


  • 1.8V–3.3V core VDD and VDDREF
  • Individual 1.8V–3.3V VDDO for each output pair
  • Supports HCSL, LVDS and LVCMOS I/O standards
  • HCSL utilizes IDT's LP-HCSL technology for improved performance, lower power and higher integration:
    • Programmable output impedance of 85Ω or 100Ω
  • On-board OTP supports up to 4 complete configurations
  • Configuration selected via strapping pins or I2C
  • Internal crystal load capacitors
  • < 135mW at 1.8V with outputs running at 100MHz (LP-HCSL)
  • 4 programmable I2C addresses: D0, D2, D4, D6
  • Supports LVPECL and CML logic with easy AC coupling – see AN-891 for alternate terminations
  • Supported by IDT Timing Commander™ software
  • Integrated 50MHz crystal option on 9FGV1008Q5
  • Programmable spread spectrum modulation frequency and amount

Product Options

Orderable Part ID Part Status Pkg. Code Output Type Output Freq Range (MHz) Core Voltage (V) Xtal Freq (MHz) Carrier Type Buy Sample
9FGV1008B000LTGI Active LTG16P1 LP-HCSL, LVCMOS, LVDS 10 - 325 1.8, 2.5, 3.3 8 - 50 Tray
9FGV1008B000LTGI8 Active LTG16P1 LP-HCSL, LVCMOS, LVDS 10 - 325 1.8, 2.5, 3.3 8 - 50 Reel
9FGV1008BQ500LTGI Active LTG16P1 LP-HCSL, LVCMOS, LVDS 10 - 325 1.8, 2.5, 3.3 8 - 50 Tray
9FGV1008BQ500LTGI8 Active LTG16P1 LP-HCSL, LVCMOS, LVDS 10 - 325 1.8, 2.5, 3.3 8 - 50 Reel

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
9FGV1008B_1008BQ Datasheet Datasheet PDF 416 KB Oct 1, 2018
Application Notes & White Papers
AN-1014 Microstrip vs Stripline: Crosstalk and RMS Phase Jitter Application Note PDF 341 KB Nov 1, 2018
AN-1001 Combining PhiClock™ and 9ZXL1951D for PCIe Gen4/5 Application Note PDF 103 KB Mar 12, 2018
PCIe Measurement Techniques for Gen5 and Beyond White Paper White Paper PDF 653 KB Jan 9, 2018
AN-975 Cascading PLLs Application Note PDF 128 KB Aug 2, 2017
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-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
Timing Solutions Products Overview Overview PDF 4.11 MB Oct 31, 2018
PCI Express® Timing Solutions Overview Overview PDF 301 KB Apr 19, 2018
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB Nov 29, 2016
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

Evaluation Boards

Part Number Title Sort ascending
EVK9FGV1008Q5 Evaluation Kit for 9FGV1008 Programmable PhiClock™ Generator with Internal 50MHz Crystal
EVK9FGV1008 Evaluation Kit for 9FGV1008 Programmable PhiClock™ Generator