SI5345D-B05092-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345D-B05092-GM is a factory preprogrammed clock synthesizer and jitter cleaner from the Si5345 Rev D family. It features four inputs and ten outputs, supporting integer and fractional frequency synthesis with output frequencies up to 350 MHz. The device utilizes fourth-generation DSPLL technology for ultra-low jitter performance of 90 fs rms. It operates on a single 1.8 V core supply (VDD) and includes in-circuit programmable non-volatile memory. The component is housed in a 64-QFN package measuring 9x9 mm and supports an operating temperature range of -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using integer and fractional synthesis modes.
• Provides ultra-low jitter attenuation of 90 fs rms via fourth-generation DSPLL technology.
• Supports hitless input clock switching between fractionally related inputs and glitchless on-the-fly output frequency changes.
• Includes in-circuit programmable non-volatile memory to ensure known frequency configuration upon power-up.

Clock Generators, PLLs, Frequency Synthesizers Applications

• OTN muxponders and transponders
• 10/40/100 G networking line cards
• GbE/10 GbE/100 GbE Synchronous Ethernet (ITU-T G.8262)
• Carrier Ethernet switches
• SONET/SDH line cards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix B05092 corresponds to the required factory preprogrammed configuration, as this part number represents a custom device with fixed settings. Confirm that the 64-QFN package dimensions and pinout match the target PCB land pattern. Ensure the design accommodates the 1.8 V core voltage requirement and the specified thermal dissipation limits for the QFN-64 enclosure.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a fixed, preconfigured clock solution is preferred over field-programmable devices. The 'D' suffix indicates support for output frequencies up to 350 MHz; verify this limit meets system requirements. The 'GM' suffix denotes lead-free and RoHS compliance. Consider the Si5345B variant if lower cost is prioritized and the 350 MHz maximum frequency is sufficient for the application.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 Rev D family, which integrates MultiSynth and DSPLL technologies. The Si5345 variant specifically offers four inputs and ten outputs in a 64-QFN package. Unlike generic family members, the B05092 suffix identifies a unique factory preprogrammed configuration, distinguishing it from blank prototyping devices like the SI5345D-D-GM.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5345D-D-GM: A blank, user-programmable alternative within the same package and family. Requires external configuration via ClockBuilder Pro software rather than relying on internal NVM settings.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the difference between the Si5345D and Si5345B variants?

The Si5345D supports output frequencies up to 350 MHz, whereas the Si5345B also supports frequencies up to 350 MHz but may differ in specific electrical characteristics or pricing tiers. Both utilize the same 64-QFN package and feature set.

How does the device handle input clock failure?

The device automatically enters holdover mode if the selected input clock becomes invalid and no other valid inputs are available. It uses stored historical frequency data to minimize phase and frequency disturbances during this transition.

Can the device switch between input clocks without glitches?

Yes, the device supports hitless switching for inputs with fixed phase relationships and glitchless switching for inputs with slight frequency differences (up to ±500 ppm apart), ensuring smooth transitions.