Silicon Labs’ Si5391 and Si56x clock generators

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.

Features:

Si5391

• 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

Si56x

• 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