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2308B - Block Diagram
2308B - Pinout


3.3V Zero Delay Clock Multiplier

The 2308B 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 2308B 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 2308B enters power down, and the outputs are tri-stated. In this mode, the device will draw less than 25uA. The 2308B 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 2308B 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): - 2308B-1 1x - 2308B-2 1x, 2x - 2308B-3 2x, 4x - 2308B-4 2x - 2308B-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)
8LVCMOS, TTL, CMOS10.000000 - 133.300000, 10.000000 - 133.00000010.000000 - 133.300000, 10.000000 - 66.600000, 10.000000 - 133.000000, 20.000000 - 266.6000001LVCMOS23.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
2308B-1DCGActiveDCG16SOIC16CYesTubeCheck Availability
2308B-1DCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308B-1DCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308B-1DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308B-1HDCGActiveDCG16SOIC16CYesTubeCheck Availability
2308B-1HDCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308B-1HDCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308B-1HDCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308B-1HPGGIActivePGG16TSSOP16IYesTubeCheck Availability
2308B-1HPGGI8ActivePGG16TSSOP16IYesReelCheck Availability
2308B-1HPGIObsoletePG16TSSOP16INoTubeCheck Availability
2308B-2DCGActiveDCG16SOIC16CYesTubeCheck Availability
2308B-2DCG8ActiveDCG16SOIC16CYesReelCheck Availability
2308B-2DCGIActiveDCG16SOIC16IYesTubeCheck Availability
2308B-2DCGI8ActiveDCG16SOIC16IYesReelCheck Availability
2308B-4DCGObsoleteDCG16SOIC16CYesTubeCheck Availability
2308B-4DCG8ObsoleteDCG16SOIC16CYesReelCheck Availability
2308B-5HPGObsoletePG16TSSOP16CNoTubeCheck Availability
2308B-1HPGGActivePGG16TSSOP16CYesTubeCheck Availability
2308B-1HPGG8ActivePGG16TSSOP16CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
2308B Datasheet Datasheet PDF 550 KB Oct 31, 2013
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 (15)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
PDN# CQ-14-05 MARKET DECLINED PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 192 KB Sep 4, 2014
PDN# : CQ-14-02R2 Product Discontinuation Notice PDF 549 KB Aug 4, 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# : CQ-14-02R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 545 KB Feb 11, 2014
PDN# : CQ-14-02 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 544 KB Jan 26, 2014
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# : A1204-01R1 Revised Notification to Remove Selective Devices from TSSOP-16 Product Change Notice PDF 332 KB Oct 2, 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
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_12 IBIS Model - IBIS ZIP 15 KB Jun 1, 2010
2308_8 IBIS Model - IBIS ZIP 14 KB Jun 1, 2010