SI5351B-B05698-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5351B-B05698-GMR is an I2C programmable clock generator from Skyworks Solutions, featuring a VCXO architecture and eight LVCMOS outputs. It operates within a core supply voltage range of 2.25 V to 3.6 V and supports output voltages of 1.8 V, 2.5 V, or 3.3 V. The device generates frequencies up to 200 MHz with 0 ppm error using a 25 MHz or 27 MHz crystal reference. Key electrical parameters include a typical period jitter of less than 70 ps peak-to-peak and a maximum operating temperature of +85 °C. It utilizes a 20-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a highly linear Voltage-Controlled Crystal Oscillator (VCXO) for synchronous clock generation without requiring custom pullable crystals.
• Generates up to eight non-integer-related frequencies simultaneously using high-resolution MultiSynth fractional dividers.
• Supports configurable spread spectrum modulation at each individual output to reduce electromagnetic interference.
• Provides glitchless frequency changes and static phase offset capabilities via an I2C user-definable configuration interface.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing traditional crystals, crystal oscillators, and VCXOs in cost-sensitive designs.
• Synchronous clock distribution in networking and communication equipment.
• Clock synthesis for servers, storage systems, and residential gateways.
• Timing solutions for audio/video equipment and handheld instrumentation.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed configuration associated with the B05698 suffix against the target design requirements. Confirm that the 20-QFN package dimensions and thermal characteristics align with the PCB layout constraints. Ensure the I2C address and register map match the system controller specifications before finalizing the procurement order.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this variant when both free-running asynchronous clocks and synchronous VCXO-controlled outputs are required on the same board. The 20-QFN package provides eight independent outputs, making it suitable for complex clock trees. Verify that the application requires the specific frequency plan programmed into the B05698 code rather than a blank, user-programmable part.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family, which includes variants A, B, and C. The 'B' designation specifically indicates the inclusion of an internal VCXO, distinguishing it from the Si5351A (free-running only) and Si5351C (external CLKIN reference). The GMR suffix denotes tape and reel packaging for surface-mount assembly.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include other Si5351B variants such as SI5351B-B-GM or SI5351B-Bxxxxx-GM. When substituting, ensure the new part supports the required VCXO tuning range and output count. Verify that any alternative does not require external load capacitors if the original design relies on the internal capacitance settings.