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2305A - Pinout


3.3V Zero Delay Clock Buffer

The 2305A 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 2305A is an 8-pin version of the 2309A. The 2305A accepts one reference input, and drives out five low skew clocks. The -1H version of this device operates up to 133MHz frequency and has a 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 2305A enters power down. In this mode, the device will draw less than 12uA for Commercial Temperature range and less than 25uA for Industrial temperature range, the outputs are tri-stated, and the PLL is not running, resulting in a significant reduction of power. The 2305A 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 outputs
  • Zero Input-Output Delay
  • Output Skew < 250ps
  • Low jitter <200 ps cycle-to-cycle
  • IDT2305A-1 for Standard Drive
  • IDT2305A-1H for High Drive
  • No external RC network required
  • Operates at 3.3V VDD
  • Power down mode
  • Available in SOIC package

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
5LVCMOS10.000000 - 133.00000010.000000 - 133.0000001LVCMOS13.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
2305A-1DCGActiveDCG8SOIC8CYesTubeCheck Availability
2305A-1DCG8ActiveDCG8SOIC8CYesReelCheck Availability
2305A-1DCGIActiveDCG8SOIC8IYesTubeCheck Availability
2305A-1DCGI8ActiveDCG8SOIC8IYesReelCheck Availability
2305A-1HDCGActiveDCG8SOIC8CYesTubeCheck Availability
2305A-1HDCG8ActiveDCG8SOIC8CYesReelCheck Availability
2305A-1HDCGIActiveDCG8SOIC8IYesTubeCheck Availability
2305A-1HDCGI8ActiveDCG8SOIC8IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
2305A Datasheet Datasheet PDF 96 KB Mar 12, 2014
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 (9)
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-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB 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# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012
show all (10)
PCN# : A1208-06 Changed of Assembly Location and Crystal Product Change Notice PDF 1.06 MB Nov 18, 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#: 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-0406-06 Qualify OSE Philippines for SOIC Product Change Notice PDF 100 KB Jul 1, 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
2305A -- Protel Schematic Symbol Misc ZIP KB Aug 24, 2004

Software & Tools

Title Type Format File Size Datesort icon
2305A Hspice Model Model - HSPICE ZIP 113 KB Jul 30, 2004
2305A IBIS Model Model - IBIS ZIP 24 KB Sep 20, 2005