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2308 - Block Diagram


3.3V Zero Delay Clock Multiplier

The 2308 is a high-speed phase-lock loop (PLL) clock multiplier. It is designed to address high-speed clock distribution and multiplication 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 2308 has two banks of four outputs each that are controlled via two select addresses. By proper selection of input addresses, both banks can be put in tri-state mode. In test mode, the PLL is turned off, and the input clock directly drives the outputs for system testing purposes. In the absence of an input clock, the 2308 enters power down, and the outputs are tri-stated. In this mode, the device will draw less than 25uA. The 2308 is available in six unique configurations for both prescaling and multiplication of the Input REF Clock. (See available options table.) The PLL is closed externally to provide more flexibility by allowing the user to control the delay between the input clock and the outputs. The 2308 is characterized for both Industrial and Commercial operation.


  • Phase-Lock Loop Clock Distribution for Applications ranging from 10MHz to 133MHz operating frequency
  • Distributes one clock input to two banks of four outputs
  • Separate output enable for each output bank
  • External feedback (FBK) pin is used to synchronize the outputs to the clock input
  • Output Skew <200 ps
  • Low jitter <200 ps cycle-to-cycle
  • 1x, 2x, 4x output options (see table): - IDT2308-1 1x - IDT2308-2 1x, 2x - IDT2308-3 2x, 4x - IDT2308-4 2x - IDT2308-1H, -2H, and -5H 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)
8LVCMOS10.000000 - 133.30000010.000000 - 66.600000, 10.000000 - 133.300000, 20.000000 - 266.6000001LVCMOS23.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
2308-1DCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-1DCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-1DCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308-1DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308-1HDCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-1HDCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-1HDCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308-1HDCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308-1HPGGActivePGG16TSSOP16CYesTubeCheck Availability
2308-1HPGG8ActivePGG16TSSOP16CYesReelCheck Availability
2308-1HPGGIActivePGG16TSSOP16IYesTubeCheck Availability
2308-1HPGGI8ActivePGG16TSSOP16IYesReelCheck Availability
2308-2DCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-2DCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-2DCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308-2DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308-2HDCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-2HDCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-2HDCGIObsoleteDCG16SOIC16IYesTubeCheck Availability
2308-2HDCGI8ObsoleteDCG16SOIC16IYesReelCheck Availability
2308-3DCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-3DCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-3DCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308-3DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308-4DCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-4DCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-4DCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308-4DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308-5HDCGActiveDCG16SOIC16CYesTubeCheck Availability
2308-5HDCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308-5HDCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308-5HDCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308-5HPGGActivePGG16TSSOP16CYesTubeCheck Availability
2308-5HPGG8ActivePGG16TSSOP16CYesReelCheck Availability
2308-5HPGGIActivePGG16TSSOP16IYesTubeCheck Availability
2308-5HPGGI8ActivePGG16TSSOP16IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
2308 Datasheet Datasheet PDF 177 KB Oct 13, 2016
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 13, 2014
show all (11)
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
AN-229: Zero Delay Buffers Application Note PDF 67 KB Jan 27, 2011
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 146 KB Jun 1, 1996
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 (26)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
PCN# : A1403-03 Gold wire to Copper wire Product Change Notice PDF 42 KB Oct 15, 2014
PCN# : TB1403-01 Changed in Carrier Tape, Plastic Reel and Quantity per Reel on TSSOP-14, TSSOP-16 Product Change Notice PDF 663 KB Apr 8, 2014
PDN# : U-12-03R4 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 72 KB Jun 20, 2013
PDN# : U-12-03R3 Product Discontinuation Notice PDF 72 KB Mar 31, 2013
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-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# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB Sep 2, 2005
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 29, 2005
PCN # L-0501-03 Die Revision Change from CD/CD4 to Z Product Change Notice PDF 156 KB Feb 4, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN # A-0406-07Rev.1, Qualify OSE-Taiwan for SSOP & TSSOP Product Change Notice PDF 21 KB Oct 22, 2004
PCN # A-0406-06 Qualify OSE Philippines for SOIC Product Change Notice PDF 100 KB Jul 1, 2004
PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB Jan 19, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
PCN#: G-0303-04, new m/c G700 & 8290 d/a material Product Change Notice PDF 130 KB Apr 14, 2003
PCN Addendum # L0203-10R1 Fab 2 to Fab 4 Transfer Product Change Notice PDF 110 KB Jan 13, 2003
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 16, 2002
PCN# L0203-10 Fab Transfer from Fab 2 to Fab 4 Product Change Notice PDF 27 KB Apr 15, 2002
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 11, 2001
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 18, 1999
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
2308 Hspice Model Model - HSPICE ZIP 89 KB Feb 28, 2001
2308_12 IBIS Model - IBIS ZIP 15 KB Jun 1, 2010
2308_12 IBIS Model Model - IBIS ZIP 14 KB Mar 7, 2013
2308_8 IBIS Model - IBIS ZIP 14 KB Jun 1, 2010
2308_8 IBIS Model Model - IBIS ZIP 14 KB Mar 7, 2013