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83905I - Block Diagram
83905I - Pinout


Low Skew,1:6 Crystal Interface-to-LVCMOS/ LVTTL Fanout Buffer

The 83905I is a low skew, 1-to-6 LVCMOS / LVTTL Fanout Buffer and a member of the  family of High Performance Clock Solutions from IDT. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 6 to 12 by utilizing the ability of the outputs to drive two series terminated lines. The 83905I is characterized at full 3.3V, 2.5V, and 1.8V, mixed 3.3V/2.5V, 3.3V/1.8V and 2.5V/1.8V output operating supply mode. Guaranteed output and part-to-part skew characteristics along with the 1.8V output capabilities makes the 83905I ideal for high performance, single ended applications that also require a limited output voltage.


  • 6 LVCMOS / LVTTL outputs
  • Outputs able to drive 12 series terminated lines
  • Crystal oscillator interface
  • Crystal input frequency range: 10MHz to 40MHz
  • Output skew: 80ps (maximum)
  • RMS phase jitter @ 25MHz, (100Hz - 1MHz): 0.26ps (typical) (VDD = VDDO = 2.5V)
    Phase noise:
    Offset                     Noise Power
      100Hz ………….. -129.7 dBc/Hz
        1kHz ………….. -144.4 dBc/Hz
      10kHz ………….. -147.3 dBc/Hz
    100kHz ………….. -157.3 dBc/Hz
  • 5V tolerant enable inputs
  • Synchronous output enables
  • Operating power supply modes:
    Full 3.3V, 2.5V and 1.8V
    mixed 3.3V core/2.5V output operating supply
    mixed 3.3V core/1.8V output operating supply
    mixed 2.5V core/1.8V output operating supply
  • -40°C to 85°C ambient operating temperature
  • Lead-Free package fully RoHS compliant

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)Divider ValueOutput Skew (ps)Additive Phase Jitter Typ RMS (ps)
6LVCMOS0.000000 - 100.0000000.000000 - 100.0000001Crystal21.8, 2.5, 3.31.8, 2.5, 3.380

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
83905AGILFActivePGG16TSSOP16IYesTubeCheck Availability
83905AGILFTActivePGG16TSSOP16IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
83905I Datasheet Datasheet PDF 492 KB Oct 3, 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 (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 (7)
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
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# : N-12-22R2 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 363 KB Jun 14, 2013
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
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

Software & Tools

Title Type Format File Size Datesort icon
83905I IBIS Model Model - IBIS ZIP 92 KB Mar 16, 2011