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 a 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

  • Fixed feedback path; 0ps input-to-output delay
  • 9 selectable SMBus addresses; multiple devices can share same SMBus segment
  • 8 dedicated OE# pins; hardware control of outputs
  • PLL or bypass mode; PLL can dejitter incoming clock
  • Selectable PLL BW; minimizes jitter peaking in downstream PLL's
  • Hardware or software control of PLL operating mode; change mode with software mode does not need power cycle
  • Spread spectrum compatible; tracks spreading input clock for EMI reduction
  • SMBus interface; unused outputs can be disabled
  • 100MHz and 133.33MHz PLL mode; legacy QPI support
  • 10  x 10 mm 72-QFN package; small board footprint

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 307 KB
Application Notes & White Papers
AN-975 Cascading PLLs Application Note PDF 255 KB
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-891 Driving LVPECL, LVDS, CML, and SSTL Logic with IDT?s ?Universal? Low-Power HCSL Outputs Application Note PDF 480 KB
AN-879 Low-Power HCSL vs Traditional HCSL Application Note PDF 235 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-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-808 PCI Express/HCSL Termination Application Note PDF 137 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCNs & PDNs
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility Product Change Notice PDF 983 KB
Other
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB