SI5345B-B05779-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B05779-GMR is a 10-output jitter attenuator and clock multiplier from the Si5345 family, manufactured by Skyworks Solutions Inc. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any combination of output frequencies from any input frequency. The device supports differential inputs ranging from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential outputs and 100 Hz to 250 MHz for LVCMOS outputs. It features ultra-low jitter performance of 90 fs rms and meets ITU-T G.8262 EEC Option 1 and 2 (SyncE) standards. The component operates within a temperature range of -40°C to +85°C and is housed in a 64-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fractional and integer synthesis modes.
• Features digitally programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz for optimized performance.
• Supports hitless input clock switching between fractionally related clocks and glitchless on-the-fly output frequency changes.
• Includes in-circuit programmable non-volatile memory (NVM) 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 B05779 against the manufacturer's current documentation to confirm the preprogrammed frequency configuration. Ensure compatibility with the required serial interface protocol (I2C or SPI) and check for any recent process change notifications that may affect pinout or electrical characteristics. Confirm RoHS compliance status as per the latest datasheet revision.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when applications require up to ten independent output clocks with frequencies capped at 350 MHz. The Si5345B variant is suitable for designs where ultra-low jitter is critical but maximum output frequencies exceeding 350 MHz are not needed. Consider the integrated loop filter and NVM capabilities if minimizing external components and ensuring deterministic startup states are priorities.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D family of jitter attenuators. The Si5345 variant specifically provides four inputs and ten outputs in a 64-QFN package, distinguishing it from the Si5344 (4 outputs) and Si5342 (2 outputs). The 'B' designation indicates the output frequency range limitation compared to the 'A' or 'C' variants.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include the SI5345A-Dxxxxx-GMR for higher frequency outputs or the SI5345C-Dxxxxx-GMR for integer-only synthesis. Cross-family alternatives from other manufacturers would require verification of pin compatibility and jitter specifications.