SI5351B-B04481-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5351B-B04481-GM is an I2C-programmable CMOS clock generator featuring a VCXO reference and eight LVCMOS outputs. It utilizes a PLL/VCXO architecture with high-resolution MultiSynth fractional dividers to generate any frequency up to 200 MHz with 0 ppm error. The device operates on a core supply voltage of 2.5 V or 3.3 V and supports output voltages of 1.8, 2.5, or 3.3 V. It accepts a fixed-frequency crystal input of 25 or 27 MHz and provides low period jitter typically less than 70 ps peak-to-peak.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates up to eight non-integer-related frequencies from 2.5 kHz to 200 MHz
• Includes highly linear VCXO for synchronous clock generation without custom pullable crystals
• Supports glitchless frequency changes and configurable spread spectrum at each output

Clock Generators, PLLs, Frequency Synthesizers Applications

• Audio/video equipment and gaming systems
• Printers, scanners, and projectors
• Handheld instrumentation and laser range finders
• Residential gateways and networking communication devices

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the factory preprogrammed configuration code '04481' against specific design requirements before procurement. Confirm that the 20-QFN package dimensions align with the target PCB land pattern. Ensure the selected operating temperature range meets the application's environmental specifications.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when both free-running asynchronous clocks and synchronous VCXO-controlled outputs are required within a single component. Verify that the system requires eight independent clock domains. Ensure the design can accommodate the necessary I2C interface connections for configuration or relies entirely on the factory-set parameters.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5351 family, which replaces discrete crystals, oscillators, and PLLs. The 'B' variant specifically integrates an internal VCXO, distinguishing it from the A (XTAL only) and C (CLKIN only) versions. The suffix indicates a factory preprogrammed configuration delivered in a 20-pin QFN package.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5351B variants with different factory codes if the specific frequency plan differs. For applications requiring fewer outputs, the Si5351A or Si5351C series may be considered if VCXO functionality is not needed.