SI5351B-B04462-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5351B-B04462-GM is an I2C-programmable CMOS clock generator featuring an integrated VCXO. It provides eight LVCMOS outputs capable of generating non-integer-related frequencies up to 200 MHz with 0 ppm error. The device operates on a core supply voltage (VDD) between 2.25 V and 3.6 V, while output buffers support independent voltages of 1.8 V, 2.5 V, or 3.3 V. It utilizes a standard 25 MHz or 27 MHz crystal reference and delivers typical period jitter below 70 ps peak-to-peak. The component is housed in 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 independent, non-integer-related clock frequencies using MultiSynth fractional dividers.
• Supports glitchless frequency changes and configurable spread spectrum modulation at each output.
• Features separate voltage supply pins allowing flexible level translation between the core logic and output drivers.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing crystals, crystal oscillators, VCXOs, and PLLs in cost-sensitive designs.
• Audio/video equipment and gaming consoles requiring multiple clock domains.
• Networking and communication systems needing precise frequency synthesis.
• Servers and storage devices utilizing low-jitter clock signals.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed configuration associated with the B04462 suffix before integration, as this variant differs from blank user-programmable versions. Confirm that the required VCXO tuning range and output frequencies match the fixed internal settings. Ensure the design accommodates the 20-QFN thermal requirements and I2C interface constraints specified in the datasheet.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a fixed, factory-defined clock plan with VCXO capability is required, eliminating the need for external programming hardware. Compare against SI5351A if VCXO functionality is unnecessary, or SI5351C if synchronization to an external CLKIN reference is preferred over internal VCXO control. Verify that the preprogrammed frequencies cover all system requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5351 family of I2C-programmable clock generators. The 'B' designation indicates the inclusion of an internal VCXO, distinguishing it from the Si5351A (XTAL only) and Si5351C (CLKIN reference). The 'GM' suffix denotes the 20-QFN package type with eight outputs, providing high pin count flexibility for complex timing architectures.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5351B-B-GM serves as the blank user-programmable equivalent in the same package. For applications not requiring VCXO functionality, the SI5351A series may be considered. If external reference synchronization is needed instead of internal VCXO control, the SI5351C series is the appropriate alternative within the same footprint.