SI5351A-B-GM1R

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5351A-B-GM1R is an I2C-programmable CMOS clock generator manufactured by Skyworks Solutions. It generates up to eight independent, non-integer-related frequencies ranging from 2.5 kHz to 200 MHz with 0 ppm synthesis error. The device utilizes a PLL and MultiSynth fractional divider architecture driven by a standard 25 or 27 MHz crystal reference. It operates on core supply voltages of 2.5 V or 3.3 V and output buffer voltages of 1.8 V, 2.5 V, or 3.3 V. The component is housed in a 16-QFN (3x3 mm) package providing four LVCMOS outputs.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• I2C programmable configuration for generating multiple asynchronous clock frequencies
• Zero ppm frequency synthesis error using high-resolution MultiSynth dividers
• Configurable spread spectrum modulation selectable at each output
• Separate voltage supply pins enabling level translation between core and output buffers

Clock Generators, PLLs, Frequency Synthesizers Applications

• XO replacement in cost-sensitive designs
• Audio/video equipment and gaming systems
• Printers, scanners, and projectors
• Residential gateways and networking communication devices

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm factory preprogramming status and package type. Ensure the required frequency plan aligns with the device's internal oscillator capabilities as this variant does not include a VCXO. Confirm availability through authorized distributors as stock levels fluctuate.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when eight outputs are not required but four independent clocks are needed. The 16-QFN package offers a smaller footprint than the 20-QFN version while maintaining low jitter performance. Verify that the application does not require synchronous clock generation relative to an external CLKIN input, as this feature is reserved for the Si5351C variant.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family of programmable clock generators. The 'A' designation indicates it relies solely on an internal oscillator for free-running clocks, distinguishing it from the Si5351B which includes a VCXO and the Si5351C which supports external CLKIN synchronization. The 'GM1R' suffix typically denotes the 16-QFN package and reel packaging format.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same package include other Si5351A variants configured for four outputs. For applications requiring VCXO functionality, consider the Si5351B series. If external reference synchronization is necessary, the Si5351C series should be evaluated instead.