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844441I - Block Diagram
844441I - Pinout

844441I

FemtoClock® SAS/SATA Clock Generator

The 844441I is a low jitter, high performance clock generator and a member of the FemtoClock® family of silicon timing products. The 844441I is designed for use in applications using the SAS and SATA interconnect. The 844441I uses an external, 25MHz, parallel resonant crystal to generate four selectable output frequencies: 75MHz, 100MHz, 150MHz, and 300MHz. This silicon based approach provides excellent frequency stability and reliability. The 844441I features down and center spread spectrum (SSC) clocking techniques.

Features

  • Designed for use in SAS, SAS-2, and SATA systems
  • Center (±0.25%) Spread Spectrum Clocking (SSC)
  • Down (-0.23% or -0.5%) SSC
  • Better frequency stability than SAW oscillators
  • One differential 2.5V LVDS output
  • Crystal oscillator interface designed for 25MHz (CL = 18pF) frequency
  • External fundamental crystal, ensures high reliability and low aging
  • Selectable output frequencies: 75MHz, 100MHz, 150MHz, 300MHz
  • Output frequency is tunable with external capacitors
  • RMS phase jitter @ 100MHz, using a 25MHz crystal (12kHz – 20MHz): 1.1936ps (typical)
  • 2.5V operating supply
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) packages

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
844441DGILFObsoletePGG16TSSOP16IYesTubeCheck Availability
844441DGILFTObsoletePGG16TSSOP16IYesReelCheck Availability
844441DMI-100LFObsoleteDCG8SOIC8IYesTubeCheck Availability
844441DMI-100LFTObsoleteDCG8SOIC8IYesReelCheck Availability
844441DMI-150LFObsoleteDCG8SOIC8IYesTubeCheck Availability
844441DMI-150LFTObsoleteDCG8SOIC8IYesReelCheck Availability
844441DMI-300LFObsoleteDCG8SOIC8IYesTubeCheck Availability
844441DMI-300LFTObsoleteDCG8SOIC8IYesReelCheck Availability
844441DMI-75LFObsoleteDCG8SOIC8IYesTubeCheck Availability
844441DMI-75LFTObsoleteDCG8SOIC8IYesReelCheck Availability

Documents

Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
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844441 Datasheet Datasheet PDF 350 KB Nov 2, 2016
Apps Notes & White Papers
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AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
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AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
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AN-846 Termination - LVDS Application Note PDF 50 KB May 13, 2014
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AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
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AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 8, 2014
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AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
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AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
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AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
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AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
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AN-837 Overdriving the Crystal Interface Application Note PDF 50 KB May 6, 2014
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AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
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AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
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AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
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AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
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AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
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AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
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AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
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AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCNs & PDNs
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PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
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PDN# : CQ-15-04 Quarterly Market Declined PDN Product Discontinuation Notice PDF 545 KB Aug 13, 2015
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PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
show all (4)
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PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
Other
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IDT Products for Radio Applications 日本語 Product Brief PDF 4.65 MB Aug 12, 2015