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 IDT23S09
accepts 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 Industrial
temperature 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 Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Active SOIC 16 C Yes Tube
Active SOIC 16 C Yes Reel
Active SOIC 16 C Yes Tube
Active SOIC 16 C Yes Reel
Active TSSOP 16 C Yes Tube
Active TSSOP 16 C Yes Reel
Active TSSOP 16 I Yes Tube
Active TSSOP 16 I Yes Reel

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
Errata# : UEN-13-02 Errata Notification Datasheet Errata PDF 125 KB
23S09 Datasheet Datasheet PDF 117 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-845 Termination - LVCMOS Application Note PDF 146 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-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
System Applications and Design Guidelines with IDT’s Zero-Delay Buffers Application Note PDF 294 KB
AN-229: Zero Delay Buffers Application Note PDF 120 KB
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 214 KB
PDN#: CQ-19-04 Product Discontinuance Notice Product Discontinuation Notice PDF 1010 KB
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB
PCN# : TB1403-01 Changed in Carrier Tape, Plastic Reel and Quantity per Reel on TSSOP-14, TSSOP-16 Product Change Notice PDF 663 KB
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB
PCN# : A-0605-05 AIT as Alternate Assembly Facility for SOIC/QSOP/SSOP/TSSOP/PDIP Product Change Notice PDF 298 KB
PCN# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB
PCN # A-0406-07Rev.1, Qualify OSE-Taiwan for SSOP & TSSOP Product Change Notice PDF 21 KB
PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB
23S09 IBIS Model Model - IBIS ZIP 31 KB
23S09 Hspice Model Model - HSPICE ZIP 113 KB
Clock Distribution Overview 日本語 Overview PDF 217 KB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
23S09 -- Protel Schematic Symbol Misc ZIP 0 KB