SI5391B-A15691-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5391B-A15691-GM is a factory pre-programmed, ultra low-jitter clock generator from Skyworks Solutions. It features 4 inputs and 12 outputs housed in a 64-QFN package. The device synthesizes any output frequency up to 350 MHz from any input frequency using integer or fractional synthesis modes. Key electrical parameters include an operating temperature range of -40°C to +85°C, a core voltage (VDD) of 1.8 V ±5%, and an analog supply (VDDA) of 3.3 V ±5%. Output formats are configurable as LVDS, LVPECL, LVCMOS, CML, or HCSL.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency
• Ultra-low phase jitter performance with precision calibration options
• Highly configurable outputs compatible with multiple signal formats

Clock Generators, PLLs, Frequency Synthesizers Applications

• 100/200/400G switches
• 56G/112G PAM4 SerDes reference clocks
• Clock tree generation replacing XOs, buffers, signal format translators
• Clocking for FPGAs, processors, memory
• Ethernet switches/routers

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific configuration encoded in the custom part number suffix against the target design requirements before procurement. Confirm that the factory pre-programmed settings match the required input/output frequencies and signal formats. Ensure compatibility with the host system's serial interface if dynamic reconfiguration is needed.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when fixed, factory-defined clock parameters are preferred over field programmability. Verify that the maximum output frequency requirement does not exceed 350 MHz. Ensure the application supports the QFN-64 package footprint and thermal characteristics. Check if the standard B-grade jitter performance meets the system specifications.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5391 family of any-frequency, any-output clock generators. It utilizes MultiSynth technology to provide versatile clock synthesis. The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from the 'A' grade which supports frequencies up to 1 GHz. The 'GM' suffix denotes the 64-QFN package and commercial temperature range.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5391A-Axxxxx-GM offers higher frequency support up to 1 GHz. Si5391C-Axxxxx-GM provides integer-only synthesis. Si5391P-Axxxxx-GM delivers precision calibration for ultra-low jitter applications.