SI5351C-B-GM1R

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5351C-B-GM1R is an I2C-programmable CMOS clock generator designed to replace crystals, oscillators, and PLLs. It synchronizes to an external reference clock (CLKIN) ranging from 10 MHz to 100 MHz. The device generates up to eight independent non-integer-related frequencies with 0 ppm error using MultiSynth fractional dividers. Operating on a core supply of 2.25 V to 3.6 V and output supplies of 1.71 V to 3.6 V, it delivers low period jitter typically under 70 ps peak-to-peak. It supports spread spectrum modulation and glitchless frequency changes within a -40 °C to +85 °C temperature range.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Synchronizes to external reference clocks via CLKIN input
• Generates multiple independent non-integer-related frequencies with zero synthesis error
• Supports configurable spread spectrum modulation at each output
• Features glitchless frequency transitions and adjustable output delays

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing crystal oscillators in cost-sensitive designs
• Networking and communication equipment
• Servers and storage systems
• Printers, scanners, and projectors

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and factory preprogramming status. Confirm that the required reference clock falls within the supported 10 MHz to 100 MHz range for the Si5351C variant. Ensure power supply sequencing requirements are met during system design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when synchronization to an external reference clock is required rather than free-running operation. Verify that the application requires up to eight outputs and operates within the specified voltage ranges. Consider alternative variants if internal crystal oscillator or VCXO functionality is needed instead of external CLKIN synchronization.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family of programmable clock generators. The 'C' designation indicates support for an external clock input (CLKIN), distinguishing it from the 'A' series which uses an internal oscillator and the 'B' series which includes a VCXO. All variants share the same MultiSynth architecture and I2C configuration interface.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5351C variants with different package options such as 10-MSOP or 16-QFN. Factory preprogrammed versions like SI5351C-Bxxxxx-GM1R offer identical functionality without requiring custom configuration.