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840N051I

FemtoClock® NG Crystal-to-LVCMOS/LVTTL Clock Synthesizer

The ICS840N051I is a LVCMOS/LVTTL clock synthesizer designed for SDH/SONET and Ethernet applications. The device generates a selectable 156.25MHz or 77.76MHz clock signal with excellent phase jitter performance. The device uses IDT’s fourth generation FemtoClock® NG technology for an optimum of high clock frequency, low phase noise performance and low power consumption.The device supports 2.5V or 3.3V voltage supply and is packaged in a small, lead-free (RoHS 6) 8-lead TSSOP package. The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements.

Features

 

  • Fourth generation FemtoClock® NG technology 
  • 155.52MHz output clock synthesized from a 19.44MHz fundamental mode crystal 
  • One 2.5V or 3.3V LVCMOS/LVTTL clock output
  • Crystal interface designed for a 12pF parallel resonant crystal
  • RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal (12kHz - 20MHz): 0.482ps (maximum) 
  • RMS phase jitter @ 156.25MHz, using a 19.53125MHz crystal (1.875MHz - 20MHz): 0.138ps (maximum) 
  • LVCMOS interface levels for the control inputs
  • Full 2.5V or 3.3V supply voltage
  • Lead-free (RoHS 6) packaging 
  • -40°C to 85°C ambient operating temperature

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
840N051BGILFActivePGG8TSSOP8IYesTubeCheck Availability
840N051BGILFTActivePGG8TSSOP8IYesReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
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ICS840N051I Data Sheet Datasheet PDF 245 KB Oct 14, 2013
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-845 Termination - LVCMOS Application Note PDF 62 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-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 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-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-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 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-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
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AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 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-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 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
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AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
PCNs & PDNs
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PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
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PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
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PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 28, 2016
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PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015