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23S09 - Block Diagram
23S09 - Pinout


3.3V Zero Delay Clock Buffer, Spread Spectrum Compatible


The IDT23S09 is a high-speed phase-lock loop (PLL) clock buffer, designed to address high-speed clock distribution applications. The zero delay is achieved by aligning the phase between the incoming clock and the output clock, operable within the range of 10 to 133MHz. The IDT23S09 is a 16-pin version of the IDT23S05. The IDT23S09accepts one reference input, and drives two banks of four low skew clocks. The -1H version of this device operates up to 133MHz frequency and has higher drive than the -1 device. All parts have on-chip PLLs which lock to an input clock on the REF pin. The PLL feedback is on-chip and is obtained from the CLKOUT pad. In the absence of an input clock, the IDT23S09 enters power down. In this mode, the device will draw less than 12μA for Commercial Temperature range and less than 25μA for Industrialtemperature range, and the outputs are tri-stated. The IDT23S09 is characterized for both Industrial and Commercial operation.


  • Phase-Lock Loop Clock Distribution
  • 10MHz to 133MHz operating frequency
  • Distributes one clock input to one bank of five and one bank of four outputs
  • Separate output enable for each output bank
  • Output Skew < 250ps
  • Low jitter <200 ps cycle-to-cycle
  • IDT23S09-1 for Standard Drive
  • IDT23S09-1H for High Drive
  • No external RC network required
  • Operates at 3.3V VDD 
  • Spread spectrum compatible
  • Available in SOIC and TSSOP packages

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Inputs (#)Input TypeOutput Voltage (V)Output Skew (ps)
9LVCMOS10.000000 - 133.0000001LVCMOS3.3250

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
23S09-1DCGActiveDCG16SOIC16CYesTubeCheck Availability
23S09-1DCG8ActiveDCG16SOIC16CYesReelCheck Availability
23S09-1DCGIActiveDCG16SOIC16IYesTubeCheck Availability
23S09-1DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
23S09-1HDCGActiveDCG16SOIC16CYesTubeCheck Availability
23S09-1HDCG8ActiveDCG16SOIC16CYesReelCheck Availability
23S09-1HDCGIActiveDCG16SOIC16IYesTubeCheck Availability
23S09-1HDCGI8ActiveDCG16SOIC16IYesReelCheck Availability
23S09-1HPGGActivePGG16TSSOP16CYesTubeCheck Availability
23S09-1HPGG8ActivePGG16TSSOP16CYesReelCheck Availability
23S09-1HPGGIActivePGG16TSSOP16IYesTubeCheck Availability
23S09-1HPGGI8ActivePGG16TSSOP16IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
Errata# : UEN-13-02 Errata Notification Datasheet PDF 125 KB Mar 6, 2013
23S09 Datasheet Datasheet PDF 62 KB Feb 20, 2013
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 13, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
show all (12)
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-834 Hot-Swap Recommendations Application Note PDF 67 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
System Applications and Design Guidelines with IDT’s Zero-Delay Buffers Application Note PDF 245 KB Sep 11, 2013
AN-229: Zero Delay Buffers Application Note PDF 67 KB Jan 27, 2011
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 146 KB Jun 1, 1996
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 (14)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
PCN# : TB1403-01 Changed in Carrier Tape, Plastic Reel and Quantity per Reel on TSSOP-14, TSSOP-16 Product Change Notice PDF 663 KB Apr 8, 2014
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
PCN# : A-0605-05 AIT as Alternate Assembly Facility for SOIC/QSOP/SSOP/TSSOP/PDIP Product Change Notice PDF 298 KB May 25, 2006
PCN# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB Sep 2, 2005
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 29, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN # A-0406-07Rev.1, Qualify OSE-Taiwan for SSOP & TSSOP Product Change Notice PDF 21 KB Oct 22, 2004
PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB Jan 19, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
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
23S09 -- Protel Schematic Symbol Misc ZIP KB Aug 24, 2004

Software & Tools

Title Type Format File Size Datesort icon
23S09 Hspice Model Model - HSPICE ZIP 113 KB May 28, 2004
23S09 IBIS Model Model - IBIS ZIP 31 KB Sep 20, 2005