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Home » NEWEST Products » New by Manufacturer » Silicon Labs » Silicon Labs Si5351 CMOS Clock Generator
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Silicon Labs

Silicon Labs Si5350 / Si5351 Any-Frequency
CMOS Clock Generators

Silicon Labs Si5350/51 highly flexible, programmable clock generators can be customized to generate up to eight independent non-integer-related frequencies. These Silicon Labs clock ICs have eight CMOS clock outputs offered in a space saving 4mm x 4mm 20-QFN and 24-QSOP package or three clock outputs offered in a 10-MSOP package. Each output has an independent MultiSynth™ fractional divider that accepts a high-frequency reference from one of the devices' internal PLLs and accurately divides down the clock to generate unique, non-integer-related frequencies from 8kHz to 133MHz. Any combination of output frequencies can be generated by the device. All clocks are generated with 0 ppm frequency synthesis error, enabling the replacement of XOs and PLL-based clocks while simplifying design and minimizing cost. As an added feature, the Si5350/51 features an integrated VCXO which eliminates the need for pullable crystals.

Silicon Labs Si535x-20QFN-EVB, Si535x-24QSOP-EVB, and SI535X-B20QFNEVB are used for evaluating the Si5350 / Si5351 any-frequency, <125 MHz CMOS clock generators + VCXO. These Si535x evaluation boards are fully powered from a single USB port and contain an onboard 27 MHz crystal for asynchronous operation.

  • Generates up to 8 non-integer frequencies from 8 kHz to 133 MHz
  • I²C user definable configuration
  • Exact frequency synthesis at each output (0 ppm error)
  • Highly linear VCXO
  • Optional clock input (CLKIN)
  • Low output period jitter: 100 ps pp
  • Configurable spread spectrum selectable at each output
  • Operates from a low-cost, fixed frequency crystal: 25 or 27 MHz
  • Glitchless frequency changes
  • Separate voltage supply pins:
    • Core VDD: 2.5 V or 3.3 V
    • Output VDDO: 2.5 V or 3.3 V
  • Excellent PSRR eliminates external power supply filtering
  • Very low power consumption
  • Adjustable output-output delay
  • Available in 3 packages types:
    • 10-MSOP: 3 outputs
    • 24-QSOP: 8 outputs
    • 20-QFN (4x4 mm): 8 outputs
  • HDTV, DVD/Blu-ray, set-top box
  • Audio/video equipment, gaming
  • Printers, scanners, projectors
  • Residential gateways
  • Networking/communication
  • Servers, storage
Part NumberPackage / CaseMax Output FreqNumber of OutputsData Sheet
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Si5351 Block Diagram

Si5351 Block Diagram
  • Silicon Labs
  • Semiconductors|Integrated Circuits|IC-Clock & Timer