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8N3D085I - Block Diagram
8N3D085I - Pinout


LVPECL Dual Frequency Programmable Crystal Oscillator


The IDT8N3D085 is a LVPECL Dual Frequency-Programmable Crystal Oscillator with very flexible frequency programming capabilities. The device uses IDT’s fourth generation FemtoClock® NG technology for an optimum of high clock frequency and low phase noise performance. The device accepts 2.5V or 3.3V supply and is packaged in a small, lead-free (RoHS 6) 6-lead ceramic 5mm x 7mm x 1.55mm package.
The device can be programmed to any frequency in the range from 15.476MHz to 866.67MHz and from 975MHz to 1,300 MHz and supports a very high degree of frequency precision of 218Hz or better. One of two pre-set output frequencies is selected by the FSEL pin.The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements.



  • Fourth generation FemtoClock® NG technology
  • Factory-programmable clock output frequency from 15.476MHz to 866.67MHz and from 975MHz to 1,300MHz
  • Frequency programming resolution is 218Hz and better
  • One 2.5V or 3.3V LVPECL clock output
  • Output enable control (positive polarity), LVCMOS/LVTTL compatible
  • LVCMOS compatible control inputs
  • RMS phase jitter @ 156.25MHz (12kHz - 20MHz): 0.24ps (typical), integer PLL feedback configuration
  • RMS phase jitter @ 156.25MHz (1kHz - 40MHz): 0.27ps (typical), integer PLL feedback configurationally
  • 2.5V or 3.3V supply
  • -40°C to 85°C ambient operating temperature
  • Available in a lead-free (RoHS 6) 6-pin ceramic package

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Supply Voltage (V)Phase Jitter Typ RMS (ps)Freq. Stability Total (± PPM)
1LVPECL15.476000 - 866.670000, 975.000000 - 1300.0000002.50, 3.300.240113

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeBudgetary Price @ 1ku (USD)Sample & Buy
8N3D085EC-1179CDIActiveCD6CDIP6IYesTrayCheck Availability
8N3D085EC-1179CDI8ActiveCD6CDIP6IYesReelCheck Availability
8N3D085KC-1064CDIActiveCD6CDIP6IYesTrayCheck Availability
8N3D085KC-1064CDI8ActiveCD6CDIP6IYesReel$ 13.42Check Availability
8N3D085KC-1074CDIActiveCD6CDIP6IYesTray$ 13.42Check Availability
8N3D085KC-1074CDI8ActiveCD6CDIP6IYesReel$ 13.42Check Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
IDT8N3D085 Datasheet Datasheet PDF 533 KB Dec 21, 2012
User Guides & Manuals
FemtoClock NG Ceramic-Package XO and VCXO Ordering Information Manual - User Reference PDF 102 KB Nov 11, 2015
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-863 Power Filter Recommendations for SMD Oscillators Application Note PDF 108 KB Jul 2, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
show all (9)
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 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-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCN# : W1308-01 Change of Passivation Thickness Product Change Notice PDF 941 KB Sep 11, 2013
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 25, 2016