Skip to main content
8634-01 - Block Diagram
8634-01 - Pinout


1-to-5 Differential-to-3.3V LVPECL Zero Delay Buffer

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

The 8634-01 is a high performance 1-to-5 Differential-to- 3.3V LVPECL Zero Delay Buffer. The 8634-01 has two selectable clock inputs. The CLKx, nCLKx pair can accept most standard differential input levels. Utilizing one of the outputs as feedback to the PLL, output frequencies up to 700MHz can be regenerated with zero delay with respect to the input. Dual reference clock inputs support redundant clock or multiple reference applications.


  • Five differential 3.3V LVPECL outputs
  • Selectable differential clock inputs
  • CLKx, nCLKx pair can accept the following differential input levels: LVPECL, LVDS, LVHSTL, HCSLSSTL
  • Output frequency range: 31.25MHz to 700MHz
  • Input frequency range: 31.25MHz to 700MHz
  • VCO range: 250MHz to 700MHz
  • External feedback for “zero delay” clock regeneration
  • Cycle-to-cycle jitter: 25ps (maximum)
  • Output skew: 25ps (maximum)
  • PLL reference zero delay: 50ps ± 100ps
  • 3.3V operating supply
  • 0°C to 70°C ambient operating temperature
  • Lead-Free package available
  • Industrial temperature information available upon request

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
5LVPECL31.250000 - 700.00000031.250000 - 700.0000002SSTL, LVPECL, LVDS, HSTL, HCSL13.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8634BK-01LFObsoleteNLG32VFQFPN32CYesTrayCheck Availability
8634BK-01LFTObsoleteNLG32VFQFPN32CYesReelCheck Availability
8634BY-01LFObsoletePRG32TQFP32CYesTrayCheck Availability
8634BY-01LFTObsoletePRG32TQFP32CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
PCN# N0612-02 Datasheet Change Datasheet PDF 12 KB Jan 15, 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-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-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 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-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
PDN# : CQ-14-03 Quarter PDN for Declined Market Product Discontinuation Notice PDF 539 KB Apr 25, 2014
PCN# : A1401-02 Alternate Copper Wire Assembly Site Product Change Notice PDF 36 KB Feb 16, 2014
PCN# : TB1303-01 Change of Carrier Tape for TQFP-32, TQFP-48 Product Change Notice PDF 472 KB Mar 31, 2013
show all (4)
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016

Software & Tools

Title Type Format File Size Datesort icon
8634-01 IBIS Model Model - IBIS ZIP 29 KB Dec 23, 2008