The 9ZXL1231E is a second-generation, enhanced performance DB1200ZL differential buffer. The part is a
pin-compatible upgrade to the 9ZXL1231A, while offering much improved phase jitter performance and increased system security features. A fixed external feedback maintains low drift for critical QPI/UPI applications.

Features

  • LP-HCSL outputs; eliminate 24 resistors, save 41mm² of area
  • 12 OE# pins; hardware control of each output
  • 9 selectable SMBus addresses; multiple devices can share the same SMBus segment
  • Selectable PLL BW; minimizes jitter peaking in cascaded PLL topologies
  • Hardware/SMBus control of PLL bandwidth and bypass; change mode without power cycle
  • Spread spectrum compatible; tracks spreading input clock for EMI reduction
  • 100MHz and 133.33MHz PLL Mode; UPI and legacy QPI support
  • 9 x 9 mm 64-VFQFPN 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
9ZXL1231EKILF Active NLG64P2 VFQFPN 64 I Yes Tray
Availability
9ZXL1231EKILFT Active NLG64P2 VFQFPN 64 I Yes Reel
Availability
9ZXL1231EKILF/W Active NLG64P2 VFQFPN 64 I Yes Reel
Availability
9ZXL1231EKILF-1K/W Active NLG64P2 VFQFPN 64 I Yes Reel
Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
9ZXL1231E_1251E Datasheet Datasheet PDF 355 KB
Application Notes & White Papers
AN-1001 Combining PhiClock™ and 9ZXL1951D for PCIe Gen4/5 Application Note PDF 103 KB
AN-975 Cascading PLLs Application Note PDF 128 KB
AN-828 Termination - LVPECL Application Note PDF 229 KB
AN-891 Driving LVPECL, LVDS, CML, and SSTL Logic with IDT's "Universal" Low-Power HCSL Outputs Application Note PDF 354 KB
AN-879 Low-Power HCSL vs Traditional HCSL Application Note PDF 150 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
AN-808 PCI Express/HCSL Termination Application Note PDF 54 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

Software & Tools

Title Other Languages Type Format File Size Date
9ZXL1231E IBIS Model Model - IBIS ZIP 22 KB

Evaluation Boards

Part Number Title Sort ascending
EVK9ZXL1951D Evaluation Kit for 19-Output DB1900Z for PCIe Gen1-4 and QPI/UPI