Enhanced DB1900Z Compliant 19-Output Buffer

The 9ZX21901D is a second generation DB1900Z differential buffer for Intel Purley and newer platforms. The part is backwards compatible to the 9ZX21901C while offering much improved phase jitter performance. A fixed external feedback maintains low drift for critical QPI/UPI applications. In bypass mode, the 9ZX21901D can provide outputs up to 400MHz. 

Features

  • 19 HCSL output pairs
  • Fixed feedback path
  • Phase jitter: PCIe Gen4 < 0.5ps rms
  • Phase jitter: UPI 9.6GT/s < 0.1ps rms
  • PLL or bypass mode; PLL can dejitter incoming clock
  • 9 selectable SMBus Addresses
  • 8 dedicated OE# pins
  • 100MHz or 133MHz PLL mode; legacy QPI support
  • Selectable PLL bandwidth; minimizes jitter peaking in downstream PLLs
  • Spread spectrum compatible
  • SMBus interface
  • 10 × 10 mm 72-QFN package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
9ZX21901DKLF Active NLG72P1 VFQFPN 72 C Yes Tray
Availability
9ZX21901DKLFT Active NLG72P1 VFQFPN 72 C Yes Reel
Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
9ZX21901D Datasheet Datasheet PDF 215 KB Apr 17, 2018
Application Notes & White Papers
AN-975 Cascading PLLs Application Note PDF 128 KB Aug 2, 2017
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
AN-808 PCI Express/HCSL Termination Application Note PDF 54 KB Jan 14, 2014
Other
PCI Express® Timing Solutions Overview Overview PDF 301 KB Apr 19, 2018
9ZX21901 Reference Schematic Schematic PDF 25 KB Apr 11, 2018
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016

Software & Tools

Title Other Languages Type Format File Size Date
9ZX21901D IBIS Model Model - IBIS ZIP 12 KB Apr 18, 2018