Electronic Component Solutions

New timing solutions for 56G/112G SerDes clocking

Silicon Labs’ Si5391 is a low jitter, any-frequency clock generator. It can provide all clock frequencies needed in 200/400/600G designs from a single IC while delivering sub-100 fs rms phase jitter performance.
The Si56x Ultra Series VCXO and XO family are customisable to any frequency up to 3 GHz. The Si56x oscillators are available with single, dual, quad, and I2C-programmable options in 5 mm x 7 mm and 3.2 mm x 5 mm packages.


  • Generates any combination of output frequencies from any input frequency
  • Ultra-low jitter performance
  • 69fs RMS (Precision Calibration)
  • 75fs RMS (integer mode)
  • 115fs RMS (fractional mode)
  • Input frequency range:
  • External crystal: 25 to 54 MHz
  • Differential clock: 10 to 750 MHz
  • LVCMOS clock: 10 to 250 MHz
  • Output frequency range:
  • Differential: 100 Hz to 1028 MHz
  • LVCMOS: 100 Hz to 250 MHz
  • Highly configurable outputs compatible with LVDS, LVPECL, LVCMOS, CML, and HCSL with programmable signal amplitude
  • Si5391: 4 input, 12 output, 64-QFN 9x9mm


  • Available with any frequency from 0.2 MHz to 3000 MHz
  • Ultra low jitter: 90 fs RMS typical (12 kHz – 20 MHz)
  • Excellent PSRR and supply noise immunity: –80 dBc Typ
  • 20 ppm temp stability (–40 to 85 °C)
  • 3.3 V, 2.5 V and 1.8 V VDD supply operation from the same part number
  • LVPECL, LVDS, CML, HCSL, CMOS, and Dual CMOS output options
  • 3.2×5, 5×7 mm package footprints

Si560 Si5391

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