SI5351B-B-GM1

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5351B-B-GM1 is an I2C-programmable CMOS clock generator featuring a built-in VCXO. It provides four LVCMOS outputs in a 16-QFN package, supporting frequencies from 2.5 kHz to 200 MHz with 0 ppm synthesis error. The device operates on a core supply of 2.25 V to 3.6 V and output supplies of 1.71 V to 3.6 V. It accepts a 25 MHz or 27 MHz crystal reference and delivers typical period jitter below 70 ps peak-to-peak.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a highly linear VCXO for synchronous clock generation without custom pullable crystals
• Generates up to four independent non-integer-related frequencies using MultiSynth fractional dividers
• Supports configurable spread spectrum modulation at each output to minimize EMI
• Features separate voltage supply pins for level translation between core and output buffers

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing crystals, crystal oscillators, and VCXOs in cost-sensitive designs
• Audio/video equipment and gaming systems
• Printers, scanners, and projectors
• Handheld instrumentation and laser range finders
• Residential gateways and networking/communication servers

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and factory programming status. Ensure that the required frequency plan aligns with the device's internal PLL and MultiSynth divider capabilities before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this variant when four outputs are sufficient and an integrated VCXO is required for synchronous applications. Compare against the Si5351A if VCXO functionality is unnecessary, or the Si5351C if external CLKIN synchronization is preferred over internal VCXO control.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family of programmable clock generators. The 'B' designation indicates the inclusion of an internal VCXO, while the 'GM1' suffix specifies the 16-QFN package configuration with four outputs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5351B-B-GM (8-output QFN-20 variant)

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum number of unique frequencies above 112.5 MHz that can be simultaneously output?

Only two unique frequencies above 112.5 MHz can be generated simultaneously.

How does the Si5351B handle VCXO tuning?

It uses a highly linear VCXO architecture controlled by a voltage input, eliminating the need for external pullable crystals.

Can the device generate both free-running and synchronous clocks?

Yes, the flexible synthesis architecture allows for generating independent free-running and synchronous clocks simultaneously.