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83905 - Block Diagram
83905 - Pinout


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

The 83905 is a low skew, 1-to-6 LVCMOS / LVTTL Fanout Buffer. 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 83905 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 83905 ideal for high performance, single ended applications that also require a limited output voltage.


  • Six 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
    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, 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
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

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
83905AGLFActivePGG16TSSOP16CYesTubeCheck Availability
83905AGLFTActivePGG16TSSOP16CYesReelCheck Availability
83905AKLFActiveNLG20P1VFQFPN20CYesTubeCheck Availability
83905AKLFTActiveNLG20P1VFQFPN20CYesReelCheck Availability
83905AMLFActiveDCG16SOIC16CYesTubeCheck Availability
83905AMLFTActiveDCG16SOIC16CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
83905 Datasheet Datasheet PDF 488 KB Sep 27, 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-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
show all (8)
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 (8)
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
PDN# : N-12-22R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 209 KB Feb 28, 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

Software & Tools

Title Type Format File Size Datesort icon
83905 IBIS Model Model - IBIS ZIP 93 KB Mar 16, 2011

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