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9DB633 - Block Diagram
9DB633 - Pinout


6-output 3.3 V PCIe Gen1-2-3 Zero Delay / Fanout Buffer

The 9DB633 zero-delay buffer supports PCIe Gen3 requirements, while being backwards compatible to PCIe Gen2 and Gen1. The 9DB633 is driven by a differential SRC output pair from an IDT 932S421 or 932SQ420 or equivalent main clock generator. It attenuates jitter on the input clock and has a selectable PLL bandwidth to maximize performance in systems with or without Spread-Spectrum clocking. An SMBus interface allows control of the PLL bandwidth and bypass options, while 2 clock request (OE#) pins make the 9DB633 suitable for Express Card applications.


  • 6 - 0.7 V current mode differential HCSL output pairs
  • Cycle-to-cycle jitter < 50 ps
  • Output-to-output skew < 50 ps
  • PCIe Gen3 phase jitter < 1.0 ps RMS
  • OE# pins/Suitable for Express Card applications
  • PLL or bypass mode/PLL can dejitter incoming clock
  • Selectable PLL bandwidth/minimizes jitter peaking in downstream PLL’s
  • Spread Spectrum Compatible/tracks spreading input clock for low EMI
  • SMBus Interface/unused outputs can be disabled

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
6HCSL10.000000 - 110.0000000.000000 - 100.000000, 50.000000 - 100.0000001HCSL13.30.8, 3.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
9DB633AFILFActivePYG28SSOP28IYesTubeCheck Availability
9DB633AFILFTActivePYG28SSOP28IYesReelCheck Availability
9DB633AFLFActivePYG28SSOP28CYesTubeCheck Availability
9DB633AFLFTActivePYG28SSOP28CYesReelCheck Availability
9DB633AGILFActivePGG28TSSOP28IYesTubeCheck Availability
9DB633AGILFTActivePGG28TSSOP28IYesReelCheck Availability
9DB633AGLFActivePGG28TSSOP28CYesTubeCheck Availability
9DB633AGLFTActivePGG28TSSOP28CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
9DB633 Datasheet Datasheet PDF 191 KB Oct 20, 2016
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-843 PCI Express Reference Clock Requirements Application Note PDF 1.81 MB May 13, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
show all (10)
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 28, 2016
show all (9)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
PCN# : A1403-03 Gold wire to Copper wire Product Change Notice PDF 42 KB Oct 15, 2014
PCN#: A1309-03 Additional Assembly Sources Product Change Notice PDF 398 KB Oct 21, 2013
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
IDT PCI Express Solutions Overview 简体中文, 日本語 Overview PDF 945 KB Aug 4, 2016
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 25, 2016
show all (5)
IDT Fanout Buffers Product Overview Product Brief PDF 739 KB Feb 17, 2015
High-Performance, Low-Phase Noise Clocks Buffers product brief Product Brief PDF 378 KB Aug 14, 2012

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