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2305 - Block Diagram
2305 - Pinout


3.3 Volt Zero Delay Low Skew Buffer

The IDT2305 is a low phase noise, high-speed PLL based, low-skew zero delay buffer. Based on the IDT proprietary low jitter Phase Locked Loop (PLL) techniques, the device provides four low skew outputs at speeds up to 133 MHz at 3.3 V. The outputs can be generated from the PLL (for zero delay), or directly from the input (for testing), and can be set to tri-state mode or to stop at a low level. The PLL feedback is on-chip and is obtained from the CLKOUT pad. The IDT2305 is available in two different versions. The IDT2305-1 is the base part. The IDT2305-1H is a high drive version with faster rise and fall times.


  • Clock outputs from 10 to 133 MHz
  • Zero input-output delay
  • Four low skew (<250 ps) outputs
  • Device-to-device skew <700 ps
  • Full CMOS outputs with 25 mA output drive capability at TTL levels
  • 5 V tolerant CLKIN
  • Tri-state mode for board-level testing
  • Advanced, low power, sub-micron CMOS process
  • Operating voltage of 3.3 V
  • Industrial temperature range available
  • Packaged in 8-pin SOIC

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Inputs (#)Input TypeOutput Voltage (V)Output Skew (ps)
5LVCMOS10.000000 - 133.0000001LVCMOS3.3250

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
2305-1DCGActiveDCG8SOIC8CYesTubeCheck Availability
2305-1DCG8ActiveDCG8SOIC8CYesReelCheck Availability
2305-1DCGIActiveDCG8SOIC8IYesTubeCheck Availability
2305-1DCGI8ActiveDCG8SOIC8IYesReelCheck Availability
2305-1PGGActivePGG8TSSOP8CYesTubeCheck Availability
2305-1PGG8ActivePGG8TSSOP8CYesReelCheck Availability
2305-1PGGActiveTSSOP8IYesTUBECheck Availability
2305-1PGG8ActiveTSSOP8IYesTUBECheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
2305 Datasheet Datasheet PDF 140 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 (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-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 (6)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil Product Change Notice PDF 223 KB Oct 6, 2006
PCN# : A-0605-05 AIT as Alternate Assembly Facility for SOIC/QSOP/SSOP/TSSOP/PDIP Product Change Notice PDF 298 KB May 25, 2006
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

Software & Tools

Title Type Format File Size Datesort icon
2305 Hspice Model Model - HSPICE ZIP 88 KB Feb 28, 2001
2305 IBIS Model Model - IBIS ZIP 24 KB Sep 20, 2005