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VCSO Based PLL for GbE 64B/66B FEC

The M2053 is a VCSO (Voltage Controlled SAW Oscillator) based clock PLL designed for FEC clock ratio translation in 10Gb optical systems such as 10GbE 64b/66b. It supports both mapping and de-mapping of 64b/66b encoding and FEC (Forward Error Correction) clock multiplication ratios. The ratios are pin-selected from pre-programming look-up tables.


  • Integrated SAW delay line
  • Output of 15 to 700 MHz *
  • Low phase jitter < 0.5 ps rms typical (12kHz to 20MHz or 50Hz to 80MHz)
  • Pin-selectable PLL divider ratios support 64b/66b and FEC encoding/decoding ratios:
  • - M2053: Map 10GbE to 66B/64B or 255/238 FEC
  • Scalable dividers provide further adjustment of loop bandwidth as well as jitter tolerance
  • LVPECL clock output (CML and LVDS options available)
  • Reference clock inputs support differential LVDS, LVPECL, as well as single-ended LVCMOSLVTTL
  • Loss of Lock (LOL) output pin
  • Narrow Bandwidth control input (NBW Pin)
  • Hitless Switching (HS) options with or without Phase Build-out (PBO) available
  • performance conforms with SONET (GR-253) /SDH (G.813) MTIE and TDEV during reference clock reselection
  • Single 3.3V power supply
  • Small 9 x 9 mm SMT (surface mount) package

Product Specification

Inputs (#)Operating FreqOutputs (#)Output SignalingInput Freq (MHz)Output Freq Range (MHz)Phase Jitter Typ RMS (ps)M/R Look-Up TableXtal Inputs (#)
2644.531002LVPECL10.000000 - 700.00000015.000000 - 700.0000000.250Yes

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
M2053-11-644.5313ObsoleteCG36CLCC36CYesTubeCheck Availability
M2053-11-644.5313TObsoleteCG36CLCC36CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
PDN# : Z-13-01 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 71 KB Mar 19, 2013