I²C-Programmable Any-Frequency CMOS Clock Generator + VCXO

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Product Information

The Si5351 is an I²C configurable clock generator that is ideally suited for replacing crystals, crystal oscillators,  VCXOs, phase-locked loops (PLLs), and fanout buffers in cost-sensitive applications. Based on a PLL/VCXO + high resolution MultiSynth fractional divider architecture, the Si5351 can generate any frequency up to 200 MHz on each of its outputs with 0 ppm error. Three versions of  the Si5351 are available to meet a wide variety of applications. The Si5351A generates up to 8 free-running clocks using an internal oscillator for replacing crystals and crystal oscillators. The Si5351B adds an internal VCXO and provides the flexibility to replace both free-running clocks and synchronous clocks. It eliminates the need for higher cost, custom pullable crystals while providing reliable operation over a wide tuning range. The Si5351C offers the same flexibility but synchronizes to an external reference clock (CLKIN).

Symmetry Electronics is an authorized Silicon Labs distributor.


Generates up to 8 non-integer-related frequencies from 2.5 kHz to 200 MHz
IC user definable configuration
Exact frequency synthesis at each output (0 ppm error)
Highly linear VCXO
Optional clock input (CLKIN)
Low output period jitter: < 70 ps pp, typ
Configurable spread spectrum selectable at each output
Operates from a low-cost, fixed frequency crystal: 25 or 27 MHz
Supports static phase offset
Programmable rise/fall time control
Glitchless frequency changes
Separate voltage supply pins provide level translation:
Core VDD: 2.5 or 3.3 V
Output VDDO: 1.8, 2.5, or 3.3 V
Excellent PSRR eliminates external power supply filtering
Very low power consumption
Adjustable output delay
Available in 2 packages types:
10-MSOP: 3 outputs
20-QFN (4x4 mm): 8 outputs
PCIE Gen 1 compatible
Supports HCSL compatible swing


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