The 844004I-04 is a 4 output LVDS Synthesizer optimized to generate clock frequencies for a variety of high performance applications and is a member of the family of high performance clock solutions from IDT. This device can select its input reference clock from either a crystal input or a singleended clock signal. It can be configured to generate 4 outputs with individually selectable divide-by-one or divide-by-four function via the 4 frequency select pins (F_SEL[3:0]). The 844004I-04 uses IDT's 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter. This ensures that it will easily meet clocking requirements for SDH (STM-1/ STM-4/STM-16) and SONET (OC-3/OC12/OC-48). This device is suitable for multi-rate and multiple port line card applications. The 844004I-04 is conveniently packaged in a small 24-pin TSSOP package.


  • Four LVDS outputs
  • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input
  • Supports the following applications: SONET/SDH, SATA, or 10Gb Ethernet
  • Output frequency range: 140MHz - 170MHz, 560MHz - 680MHz
  • VCO range: 560MHz - 680MHz
  • Crystal oscillator and CLK range: 17.5MHz - 21.25MHz
  • RMS phase jitter @ 622.08MHz output, using a 19.44MHz crystal (12kHz - 20MHz): 0.71ps (typical)
  • RMS phase jitter @ 156.25MHz output, using a 19.53125MHz crystal (1.875MHz - 20MHz): 0.51ps (typical)
  • RMS phase jitter @ 155.52MHz output, using a 19.44MHz crystal (12kHz - 5MHz): 0.75ps (typical)
  • Full 3.3V supply mode
  • -40°C to 75°C ambient operating temperature
  • Available in lead-free RoHS compliant package

Product Options

Orderable Part ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete TSSOP 24 I Yes Tube
Obsolete TSSOP 24 I Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-846 Termination - LVDS Application Note PDF 133 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 128 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-832 Timing Budget and Accuracy Application Note PDF 131 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-837 Overdriving the Crystal Interface Application Note PDF 133 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 160 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCN# : TB1303-01 Change of Carrier Tape for TQFP-32, TQFP-48 Product Change Notice PDF 472 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB