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.

Features

  • 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

Product Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
844201BKI-45LF
Package Info
PCB Symbol, Footprint, and 3D Model
Obsolete VFQFPN 16 I Yes Tray
Availability
Buy / Quote
844201BKI-45LFT
Package Info
PCB Symbol, Footprint, and 3D Model
Obsolete VFQFPN 16 I Yes Reel
Availability
Buy / Quote

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ICS844201-45 Datasheet – Datasheet PDF 479 KB
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-843 PCI Express Reference Clock Requirements – Application Note PDF 1.90 MB
AN-842 Thermal Considerations in Package Design and Selection – Application Note PDF 495 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-837 Overdriving the Crystal Interface – Application Note PDF 133 KB
AN-832 Timing Budget and Accuracy – Application Note PDF 131 KB
AN-834 Hot-Swap Recommendations – Application Note PDF 153 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-808 PCI Express/HCSL Termination – Application Note PDF 137 KB
AN-806 Power Supply Noise Rejection – Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads – Application Note PDF 121 KB
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products – Application Note PDF 108 KB
PCNs & PDNs
PCN# : TB1912-02(R1) Convert Shipping Media
from Tube or Tray to Cut Reel 		– Product Change Notice PDF 5.71 MB
PCN# : TB1912-02 Convert Shipping Media
from Tube or Tray to Cut Reel 		– Product Change Notice PDF 5.61 MB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility – Product Change Notice PDF 983 KB
PDN# : CQ-19-01(R1) Quarterly Market Declined PDN – Product Discontinuation Notice PDF 1014 KB
PDN# : CQ-19-01 Quarterly Market Declined PDN – Product Discontinuation Notice PDF 537 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location – Product Change Notice PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location – Product Change Notice PDF 544 KB
PCN# : A1309-01 Changed of Traceability Mark Format – Product Change Notice PDF 439 KB
Downloads
844201I-45 IBIS Model – Model - IBIS ZIP 31 KB
Other
PCI Express Timing Solutions Overview – Overview PDF 275 KB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
info: For device-specific or order-specific documentation, submit a support request.

News & Additional Resources

Type Date
Comparing and Contrasting PCIe and Ethernet Clock Jitter Specifications Blog Post May 21, 2018
IDT Extends Leadership in Datacenter and Networking Systems with Launch of Its Latest PCI Express Timing Devices News Apr 30, 2018
An Insider’s Guide to Finding the Right Timing Device for Your System Blog Post Dec 18, 2017
Why Fanout Buffers Make More Sense Blog Post Nov 28, 2017