Clocks & Timing

Overview

The 844201I-45 is a PCI Express®TM Clock Generator. The 844201I-45 can synthesize 100MHz or 125MHz reference clock frequencies with a 25MHz crystal. The 844201I-45 has excellent phase jitter performance and is packaged in a small 16-pin VFQFN, making it ideal for use in systems with limited board space.

844201I-45 - Block Diagram

844201I-45 - Block Diagram

844201I-45 - Pinout

844201I-45 - Pinout
844201I-45 - Block Diagram
844201I-45 - Pinout
  • One differential LVDS output pair
  • Crystal oscillator interface designed for 18pF, 25MHz parallel resonant crystal
  • VCO range: 490MHz - 680MHz
  • RMS phase jitter at 100MHz (12kHz - 20MHz): 0.792ps (typical)
  • RMS phase jitter at 125MHz (12kHz - 20MHz): 0.773ps (typical)
  • Full 3.3V output supply mode
  • PCI Express® (2.5 Gb/s) and Gen 2 (5 Gb/S) jitter compliant
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Documentation

Title Type Date
ICS844201-45 Datasheet
PDF479 KB
Datasheet
AN-827 Application Relevance of Clock Jitter
PDF1.99 MB
Application Note
AN-828 Termination - LVPECL
PDF322 KB
Application Note
AN-831 The Crystal Load curve
PDF395 KB
Application Note
AN-843 PCI Express Reference Clock Requirements
PDF1.90 MB
Application Note
AN-846 Termination - LVDS
PDF133 KB
Application Note
AN-842 Thermal Considerations in Package Design and Selection
PDF495 KB
Application Note
AN-840 Jitter Specifications for Timing Signals
PDF442 KB
Application Note
AN-838 Peak-to-Peak Jitter Calculations
PDF115 KB
Application Note
AN-839 RMS Phase Jitter
PDF233 KB
Application Note
AN-832 Timing Budget and Accuracy
PDF131 KB
Application Note
AN-834 Hot-Swap Recommendations
PDF153 KB
Application Note
AN-837 Overdriving the Crystal Interface
PDF133 KB
Application Note
AN-830 Quartz Crystal Drive Level
PDF143 KB
Application Note
AN-815 Understanding Jitter Units
PDF565 KB
Application Note
AN-802 Crystal-Measuring Oscillator Negative Resistance
PDF136 KB
Application Note
AN-801 Crystal-High Drive Level
PDF202 KB
Application Note
AN-805 Recommended Ferrite Beads
PDF121 KB
Application Note
AN-806 Power Supply Noise Rejection
PDF438 KB
Application Note
AN-808 PCI Express/HCSL Termination
PDF137 KB
Application Note
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products
PDF108 KB
Application Note
PDN# : CQ-19-01(R1) Quarterly Market Declined PDN
PDF1014 KB
End Of Life Notice
PDN# : CQ-19-01 Quarterly Market Declined PDN
PDF537 KB
End Of Life Notice
PCI Express Timing Solutions Overview
PDF2.40 MB
Overview
IDT Clock Generation Overview
PDF1.83 MB
Overview
PCN# : TB1912-02(R1) Convert Shipping Media from Tube or Tray to Cut Reel
PDF5.71 MB
Product Change Notice
PCN# : TB1912-02 Convert Shipping Media from Tube or Tray to Cut Reel
PDF5.61 MB
Product Change Notice
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility
PDF983 KB
Product Change Notice
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location
PDF596 KB
Product Change Notice
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location
PDF544 KB
Product Change Notice
PCN# : A1309-01 Changed of Traceability Mark Format
PDF439 KB
Product Change Notice
info: For device-specific or order-specific documentation, submit a support request.

Design & Development

Software Downloads

Title Type Date
PDN# : CQ-19-01(R1) Quarterly Market Declined PDN
PDF1014 KB
End Of Life Notice
PDN# : CQ-19-01 Quarterly Market Declined PDN
PDF537 KB
End Of Life Notice

ECAD Models

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Videos & Training

PCIe Clocking Architectures (Common and Separate)
Video List