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9DB403D - Block Diagram
9DB403D - Pinout


4-output Differential Buffer For PCIe Gen1-2

The 9DB403 is compatible with the Intel DB400v2 Differential Buffer Specification. This buffer provides 4 PCI Express® Gen2 clocks. The 9DB403 is driven by a differential output pair from a CK410B+, CK505 or CK509B main clock generator.


  • 4 - 0.7 V current-mode differential output pairs
  • Supports zero delay buffer mode and fanout mode
  • Bandwidth programming available
  • 50-100 MHz operation in PLL mode
  • 50-400 MHz operation in Bypass mode
  • Spread spectrum modulation tolerant, 0 to -0.5% down spread and +/- 0.25% center spread.
  • Supports undriven differential outputs in PD# and SRC_STOP# modes for power management.
  • Outputs cycle-cycle jitter < 50 ps
  • Outputs skew: 50 ps
  • Phase jitter: PCIe Gen1 < 86 ps peak to peak
  • Phase jitter: PCIe Gen2 < 3.0/3.1 ps rms
  • 28-pin SSOP/TSSOP pacakge
  • Available in RoHS compliant packaging
  • Supports Commercial (0 to +70°C) and Industrial (-40 to +85°C) temperature ranges

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
4HCSL33.000000 - 400.00000033.000000 - 400.0000001HCSL13.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
9DB403DFILFActivePYG28SSOP28IYesTubeCheck Availability
9DB403DFILFTActivePYG28SSOP28IYesReelCheck Availability
9DB403DFLFActivePYG28SSOP28CYesTubeCheck Availability
9DB403DFLFTActivePYG28SSOP28CYesReelCheck Availability
9DB403DGILFActivePGG28TSSOP28IYesTubeCheck Availability
9DB403DGILFTActivePGG28TSSOP28IYesReelCheck Availability
9DB403DGLFActivePGG28TSSOP28CYesTubeCheck Availability
9DB403DGLFTActivePGG28TSSOP28CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
9DB403D Datasheet Datasheet PDF 194 KB 11/01/2012
Apps Notes & White Papers
AN-843 PCI Express Reference Clock Requirements Application Note PDF 1.81 MB 05/13/2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB 05/12/2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB 05/08/2014
show all (7)
AN-828 Termination - LVPECL Application Note PDF 229 KB 05/01/2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB 04/24/2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB 04/24/2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB 01/15/2014
IDT Clock Distribution Overview Overview PDF 4.02 MB 11/18/2015
IDT Clock Generation Overview Overview PDF 2.10 MB 11/16/2015