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8344-01 - Block Diagram
8344-01 - Pinout


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

Alternative Products
NOTICE - The following device(s) are recommended alternatives:
Functionally compatible

The 8344-01 is a low voltage, low skew fanout buffer and a member of the family of High Performance Clock Solutions from IDT. The 8344-01 has two selectable clock inputs. The CLKx, nCLKx pairs can accept most standard differential input levels. The 8344-01 is designed to translate any differential signal level to LVCMOS/LVTTL levels. The low impedance LVCMOS/LVTTL 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 inputs which also facilitate board level testing. The clock enable is internally synchronized to eliminate runt pulses on the outputs during asynchronous assertion/deassertion of the clock enable pin. The outputs are driven low when disabled. The 8344-01 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 8344-01 ideal for those clock distribution applications demanding well defined performance and repeatability.


  • Twenty-four LVCMOS/LVTTL outputs, 7Ω typical output impedance
  • Two selectable differential CLKx, nCLKx inputs
  • CLK0, nCLK0 and CLK1, nCLK1 pairs can accept the following input levels: LVDS, LVPECL, LVHSTL, SSTLHCSL
  • Output frequency up to 250MHz
  • Translates any single ended input signal to LVCMOS/LVTTL with resistor bias on nCLK input
  • Synchronous clock enable
  • Additive phase jitter RMS: 0.21ps (typical)
  • Output skew: 200ps (maximum)
  • Part-to-part skew: 900ps (maximum)
  • Bank skew: 85ps (maximum)
  • Propagation delay: 5ns (maximum)
  • Output 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 - 250.0000000.000000 - 250.0000002HSTL, LVDS, LVPECL, SSTL, HCSL12.5, 3.32000.21

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8344AY-01LFObsoletePRG48TQFP48CYesTrayCheck Availability
8344AY-01LFTObsoletePRG48TQFP48CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
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 (13)
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-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 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
Netcom LVCMOS Driver Termination Application Note PDF 147 KB Mar 16, 2006
PCN# : A1402-02 Alternate Assembly Locations Product Change Notice PDF 34 KB Sep 28, 2014
PDN# : CQ-14-03 Quarter PDN for Declined Market Product Discontinuation Notice PDF 539 KB Apr 25, 2014
PCN# : TB1303-01 Change of Carrier Tape for TQFP-32, TQFP-48 Product Change Notice PDF 472 KB Mar 31, 2013
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
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
8344-01 IBIS Model Model - IBIS ZIP 9 KB Feb 4, 2008