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8344 - Block Diagram
8344 - Pinout


Low Skew,1-to-24 Differential-to-LVCMOS Fanout Buffer

The 8344 is a low voltage, low skew, 1-to-24 Differentialto- LVCMOS Fanout Buffer. The 8344 is designed to translate any differential signal levels to LVCMOS levels. The low impedance LVCMOS outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased to 48 by utilizing the ability of the outputs to drive two series terminated lines. Redundant clock applications can make use of the dual clock input. The dual clock inputs also facilitate board level testing. 8344 is characterized at full 3.3V, full 2.5V and mixed 3.3V input and 2.5V output operating supply modes. Guaranteed output and part-to-part skew characteristics make the 8344 ideal for those clock distribution applications demanding well defined performance and repeatability.


  • Twenty-four LVCMOS outputs, 7Ω typical output impedance
  • Selectable differential clock input pairs for redundant clock applications
  • CLKx, nCLKx pairs can accept the following differential input levels: LVDS, LVPECL, LVHSTL, SSTLHCSL
  • Maximum output frequency: 167MHz
  • Translates any differential input signal (LVPECL, LVHSTL, LVDS) to LVCMOS without external bias networks
  • Translates any single-ended input signal to LVCMOS with resistor bias on nCLK input
  • Multiple output enable pins for disabling unused outputs in reduced fanout applications
  • Output skew: 275ps (maximum)
  • Part-to-part skew: 600ps (maximum)
  • Bank skew: 150ps (maximum)
  • Propagation Delay: 4.3ns (maximum)
  • 3.3V, 2.5V or mixed 3.3V, 2.5V operating supply modes
  • 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 Skew (ps)Additive Phase Jitter Typ RMS (ps)
24LVCMOS0.000000 - 167.0000000.000000 - 167.0000002HSTL, LVDS, LVPECL, SSTL, HCSL32.5, 3.3275

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8344BYLFActivePRG48TQFP48CYesTrayCheck Availability
8344BYLFTActivePRG48TQFP48CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
8344 DATASHEET Datasheet PDF 201 KB Mar 24, 2015
8344I DCR Datasheet DOC 67 KB May 23, 2007
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 (12)
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-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-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 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# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
show all (6)
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
PCN# : A1402-02 Alternate Assembly Locations Product Change Notice PDF 34 KB Sep 28, 2014
PCN# : TB1303-01 Change of Carrier Tape for TQFP-32, TQFP-48 Product Change Notice PDF 472 KB Mar 31, 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