Skyworks

Ultra Low-Jitter Clock Generator


Si5391
The any-frequency, any-output Si5391 clock generators combine a wide-band PLL with proprietary MultiSynth™ fractional synthesizer technology to offer a versatile and high performance clock generator platform.
Ultra Low-Jitter Clock Generator
Ultra Low-Jitter, 12-Output, Any-Frequency, Any-Output Clock Generator

The any-frequency, any-output Si5391 clock generators combine a wide-band PLL with proprietary MultiSynth™ fractional synthesizer technology to offer a versatile and high performance clock generator platform. This highly flexible architecture is capable of synthesizing a wide range of integer and non-integer related frequencies up to 1 GHz on 12 differential clock outputs while delivering sub-100 fs rms phase jitter performance optimized for 100G/200G/400G applications. Each of the clock outputs can be assigned its own format and output voltage enabling the Si5391 to replace multiple clock ICs and oscillators with a single device making it a true "clock tree on a chip." The Si5391 can be quickly and easily configured using ClockBuilderPro software. Custom part numbers are automatically assigned using ClockBuilder™ Pro for fast, free, and easy factory pre-programming or the Si5391 can be programmed via I2C and SPI serial interfaces.

Applications:
  • 100/200/400G switches
  • 56G/112G PAM4 SerDes reference clocks
  • Clock tree generation replacing XOs, buffers, signal format translators
  • Clocking for FPGAs, processors, memory
  • Ethernet switches/routers
  • OTN framers/mappers/processors

Key Features

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

*Skyworks Authorized Distributor
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