SI5350B-B11979-GM1

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5350B-B11979-GM1 is a factory-programmable CMOS clock generator with an integrated VCXO, housed in a 16-QFN package providing four outputs. It generates non-integer-related frequencies from 2.5 kHz to 200 MHz using a 25 or 27 MHz crystal reference. The device supports independent core (2.25 V–3.6 V) and output (1.71 V–3.6 V) supply voltages. Key electrical characteristics include typical period jitter of 40 ps pk-pk for four outputs and a maximum operating temperature of 85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a clock generator and VCXO into a single device to replace multiple crystals and oscillators.
• Generates up to eight non-integer-related frequencies with exact synthesis and zero ppm error.
• Supports glitchless frequency changes and configurable spread spectrum for EMI reduction.
• Features user-configurable control pins for output enable, power down, and frequency selection.

Clock Generators, PLLs, Frequency Synthesizers Applications

• HDTV, DVD/Blu-ray, and set-top box systems
• Audio/video equipment and gaming consoles
• Printers, scanners, and projectors
• Handheld instrumentation devices
• Residential gateways and networking communication equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory-programmed configuration associated with the B11979 suffix against the ClockBuilder Pro design file. Confirm that the 16-QFN package meets the board layout requirements. Ensure the selected 25 MHz or 27 MHz crystal matches the internal load capacitance settings programmed into the device.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when a custom timing solution requiring both free-running and synchronous clocks is needed. The 16-QFN package provides four outputs, suitable for designs where three or fewer outputs are required but a compact footprint is preferred over the 10-MSOP. Verify that the application does not require more than two unique frequencies above 112.5 MHz simultaneously.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5350B family of factory-programmable clock generators. The 'GM1' suffix indicates the 16-QFN package variant with four outputs. Other variants in the series include the 3-output MSOP and 8-output QFN packages, all sharing the same core architecture and programming methodology via ClockBuilder Pro software.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements within the same family include SI5350B-Bxxxxx-GT (3-output MSOP) or SI5350B-Bxxxxx-GM (8-output QFN) if pin count and I/O requirements allow. Cross-family replacement with Si5351B requires verification of I2C vs. Pin programming interfaces and output count differences.