The 8731-01 is a low voltage, low skew, 1-to-11 Differential-to-3.3V LVPECL Clock Multiplier/Zero Delay Buffer. With output frequencies up to 700MHz the 8731-01 is targeted at high performance clock applications. Along with a fully integrated PLL the 8731- 01 contains frequency configurable, differential outputs and external feedback inputs for multiplying clock frequencies and regenerating clocks with "zero delay". Frequency multiplication is achieved by utilizing the separate feedback and clock output dividers. The value of the multiplier is determined by the ratio of the feedback divider, M, to the output divider,N. For multiplier values greater than 1, M must be greater than N. For multiplier values less than 1,M must be less than N. The zero delay mode is achieved with M and N at equal values. The divide values of the clock and feedback outputs are controlled by the DIV_SEL0:2 and FB_SEL0:1 inputs, respectively. The 8731-01 accepts any differential signal and translates it to differential 3.3V LVPECL output levels.


  • Eleven differential 3.3V LVPECL outputs
  • Differential reference clock input pair
  • REF_CLK, nREF_CLK pair can accept the following differential input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
  • Maximum output frequency: 700MHz
  • Maximum reference clock input frequency: 200MHz
  • VCO range: 250MHz - 700MHz
  • Accepts any single-ended input signal with a resistor bias on nCLK input
  • External feedback for zero delay capabilitiy
  • Output skew: 70ps (maximum)
  • Cycle-to-cycle jitter: 65ps (maximum)
  • Full 3.3V operating supply
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free RoHS compliant package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
8731CY-01LF Obsolete PRG48 TQFP 48 C Yes Tray
8731CY-01LFT Obsolete PRG48 TQFP 48 C Yes Reel

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
8731-01 Datasheet Datasheet PDF 249 KB Jul 14, 2015
Application 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 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 10, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 2014
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 5, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 5, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
PDN# : CQ-16-04 QUARTER MARKET DECLINED PDN Product Discontinuation Notice PDF 560 KB Nov 2, 2016
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 13, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 14, 2016
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 21, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 20, 2015
PCN#: A1309-03 Additional Assembly Sources Product Change Notice PDF 398 KB Oct 20, 2013
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB Oct 10, 2013
PCN# : TB1303-01 Change of Carrier Tape for TQFP-32, TQFP-48 Product Change Notice PDF 472 KB Mar 30, 2013
Timing Solutions Products Overview Overview PDF 4.11 MB Oct 31, 2018
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 24, 2016

Software & Tools

Title Other Languages Type Format File Size Date
8731-01 IBIS Model Model - IBIS ZIP 27 KB Jan 4, 2009