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Networking Clock Source

The IDT650-27 is a low cost, low-jitter, high-performance clock synthesizer for networking applications. Using analog Phase Locked Loop (PLL) techniques, the device accepts a 12.5 MHz or 25 MHz clock or fundamental mode crystal input to produce multiple output clocks for networking chips, PCI devices, SDRAM, and ASIDT. The IDT650-27 outputs all have zero ppm synthesis error. The IDT650-27 is pin compatible and functionally equivalent to the IDT650-07. It is a performance upgrade and is recommended for all new 3.3 V designs. See the MK74CB214, IDT551, and IDT552-01 for non-PLL buffer devices which produce multiple low-skew copies of these output clocks. See the IDT570, IDT9112-16/17/18 for zero delay buffers that can synchronize outputs and other needed clocks.


  • Packaged in 20-pin (150 mil) SSOP (QSOP)
  • Available in Pb (lead) free package
  • 12.5 MHz or 25 MHz fundamental crystal or clock input
  • Six output clocks with selectable frequencies
  • SDRAM frequencies of 67, 83, 100, and 133 MHz
  • Buffered crystal reference output
  • Zero ppm synthesis error in all clocks
  • Ideal for PCM-Sierra’s ATM switch chips
  • Full CMOS output swing with 25 mA output drive capability at TTL levels
  • Advanced, low-power, sub-micron CMOS process
  • Operating voltage of 3.3 V
  • Industrial temperature range only

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Inputs (#)Input TypeInput Freq (MHz)Output Voltage (V)Output Banks (#)Phase Jitter Typ RMS (ps)
7LVCMOS8.333300, 12.500000, 16.666700, 20.833300, 25.000000, 33.333300, 37.500000, 41.666700, 50.000000, 62.500000, 66.666700, 75.000000, 83.333300, 100.000000, 125.000000, 133.3333007LVCMOS, Crystal12.500000, 25.0000003.33

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
650R-27ILFActivePCG20QSOP20IYesTubeCheck Availability
650R-27ILFTActivePCG20QSOP20IYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
650-27 Datasheet Datasheet PDF 202 KB May 14, 2010
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
show all (17)
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 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-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
show all (4)
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012