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2309B - Block Diagram
2309B - Pinout


3.3V Zero Delay Clock Buffer

The IDT2309B 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 IDT2309B is a 16-pin version of the IDT2305B. The IDT2309B accepts one reference input, and drives two banks of four low skew clocks. The -1H version of this device operates at 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 IDT2309B enters power down, and the outputs are tri-stated. In this mode, the device will draw less than 25?A. The IDT2309B 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 <175 ps cycle-to-cycle
  • 50ps typical cycle-to-cycle jitter (15pF, 66MHz)
  • IDT2309B-1 for Standard Drive
  • IDT2309B-1H for High Drive
  • No external RC network required
  • Operates at 3.3V VDD
  • Available in SOIC and TSSOP packages

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
9TTL, CMOS, LVCMOS10.000000 - 133.00000010.000000 - 133.0000001LVCMOS2, 33.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
2309B-1DCGObsoleteDCG16SOIC16CYesTubeCheck Availability
2309B-1HDCGObsoleteDCG16SOIC16CYesTubeCheck Availability
2309B-1HDCGIObsoleteDCG16SOIC16IYesTubeCheck Availability
2309B-1HPGGObsoletePGG16TSSOP16CYesTubeCheck Availability
2309B-1HPGGIObsoletePGG16TSSOP16IYesTubeCheck Availability
2309B-1DCG8ObsoleteDCG16SOIC16CYesReelCheck Availability
2309B-1HDCG8ObsoleteDCG16SOIC16CYesReelCheck Availability
2309B-1HDCGI8ObsoleteDCG16SOIC16IYesReelCheck Availability
2309B-1HPGG8ObsoletePGG16TSSOP16CYesReelCheck Availability
2309B-1HPGGI8ObsoletePGG16TSSOP16IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
2309B Datasheet Datasheet PDF 122 KB Aug 16, 2012
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 (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-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
PDN# : U-13-05R2 PRODUCT DISCONTINUANCE NOTICE (REVISED) Product Discontinuation Notice PDF 161 KB Oct 29, 2013
PDN# : U-13-05R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 161 KB Jul 25, 2013
PDN# : U-13-05 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 159 KB Apr 10, 2013
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016