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2305B - Block Diagram
2305B - Pinout


3.3V Zero Delay Clock Buffer

The 2305B 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 2305B is an 8-pin version of the 2309B. The 2305B 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 2305B enters power down. In this mode, the device will draw less than 25μA, the outputs are tri-stated, and the PLL is not running, resulting in a significant reduction of power. The 2305B 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 <175 ps cycle-to-cycle
  • 50ps typical cycle-to-cycle jitter (15pF, 66MHz)
  • 2305B-1 for Standard Drive
  • 2305B-1H for High Drive
  • No external RC network required
  • Operates at 3.3V VDD
  • Power down mode
  • Available in SOIC and TSSOP packages

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Inputs (#)Input TypeOutput Voltage (V)Output Skew (ps)
5LVCMOS, CMOS, TTL10.000000 - 133.0000001LVCMOS3.3250

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
2305B-1DCGActiveDCG8SOIC8CYesTubeCheck Availability
2305B-1DCG8ActiveDCG8SOIC8CYesReelCheck Availability
2305B-1DCGIActiveDCG8SOIC8IYesTubeCheck Availability
2305B-1DCGI8ActiveDCG8SOIC8IYesReelCheck Availability
2305B-1HDCGActiveDCG8SOIC8CYesTubeCheck Availability
2305B-1HDCG8ActiveDCG8SOIC8CYesReelCheck Availability
2305B-1HDCGIActiveDCG8SOIC8IYesTubeCheck Availability
2305B-1HDCGI8ActiveDCG8SOIC8IYesReelCheck Availability
2305B-1PGGActivePGG8TSSOP8CYesTubeCheck Availability
2305B-1PGG8ActivePGG8TSSOP8CYesReelCheck Availability
2305B-1PGGIActivePGG8TSSOP8IYesTubeCheck Availability
2305B-1PGGI8ActivePGG8TSSOP8IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
2305B Datasheet Datasheet PDF 188 KB Apr 26, 2016
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
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 (8)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012
PCN# : A1208-06 Changed of Assembly Location and Crystal Product Change Notice PDF 1.06 MB Nov 18, 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
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