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2.5V LVDS 1:16 Clock Fanout Buffer

The 8T349316 is a 2.5V differential clock buffer with sixteen LVDS outputs. The fanout from a differential input to the sixteen LVDS outputs reduces loading on the preceding driver and provides an efficient clock distribution network. The 8T349316 can act as a translator from a differential HSTL, LVPECL, CML or LVDS input to LVDS output signals. A single-ended 3.3V, 2.5V LVCMOS/LVTTL input can also be used to translate to LVDS outputs. The redundant input capability allows for an asynchronous change-over from a primary clock source to a secondary clock source. Selectable reference inputs are controlled by SEL. The 8T349316 outputs can be asynchronously enabled/disabled. When disabled, the outputs will drive to the value selected by the GL pin. Multiple power and grounds reduce noise.The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements. The device is a member of the high-performance clock family from IDT.


  • Clock signal selection and fanout to 16 LVDS outputs
  • Guaranteed Low Skew < 50ps (max)
  • Low output pulse skew < 125ps (max)
  • Propagation delay < 1.75ns (max)
  • Up to 1GHz clock signal operation
  • Support the following input types: HSTL, LVPECL, HCSLLVTTL
  • Selectable differential input
  • Power-down mode
  • Full 2.5V power supply
  • -40°C to +85°C ambient operating temperature
  • Lead-free (RoHS 6) 52-lead VFQFN-P packaging
  • Replacement device for the 5T9316

Product Specification

Additive Phase Jitter Typ RMS (ps)Output Skew (ps)Core Voltage (V)Inputs (#)Input TypeInput Freq (MHz)Output Voltage (V)Outputs (#)Output TypeOutput Freq Range (MHz)
502.52LVPECL, HSTL, HCSL, LVTTL1000.0000002.516LVDS1000.000000

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8T349316NLGIActiveNLG52VFQFPN52IYesTrayCheck Availability
8T349316NLGI8ActiveNLG52VFQFPN52IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
8T349316I Data Sheet Datasheet PDF 396 KB Nov 7, 2014
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-846 Termination - LVDS Application Note PDF 50 KB May 13, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
show all (11)
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-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 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
PDN# : CQ-13-02 (R1) PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 601 KB Dec 22, 2013
PDN# : CQ-13-02 Q2FY14 Quarter PDN for Manufacturing Discontinuance Product Discontinuation Notice PDF 327 KB Oct 27, 2013
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
show all (6)
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN#: L-0405-04 To comply with current EIA Std Product Change Notice PDF 143 KB May 18, 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
IDT Fanout Buffers Product Overview Product Brief PDF 739 KB Feb 17, 2015
show all (4)
High-Performance, Low-Phase Noise Clocks Buffers product brief Product Brief PDF 378 KB Aug 14, 2012