SI5345B-B04220-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04220-GM is a low-jitter, 10-output clock synthesizer and jitter attenuator from Skyworks Solutions. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any combination of output frequencies from any input frequency. The device supports differential inputs from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential formats and up to 250 MHz for LVCMOS. It features ultra-low jitter performance of 90 fs rms and meets ITU-T G.8262 EEC Option 1 and 2 standards. The component operates on a single 1.8 V core supply and includes in-circuit programmable non-volatile memory.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fractional and integer synthesis.
• Supports hitless input clock switching between fractionally related clocks without phase offset propagation.
• Includes automatic and manual input selection with holdover mode capabilities for continuous operation during input loss.
• Features digitally programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz.

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 factory preprogrammed configuration associated with the B04220 suffix against the required system specifications. Confirm that the QFN-64 package dimensions match the PCB land pattern requirements. Ensure compatibility with the ClockBuilder Pro software version used for initial configuration and NVM programming.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a fixed 350 MHz maximum output frequency is sufficient, offering cost advantages over higher-frequency variants. Verify that the 10-output count aligns with system requirements, as other family members offer fewer outputs. Ensure the design accommodates the 64-QFN package footprint and thermal dissipation needs under maximum load conditions.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5345 family, which integrates fourth-generation DSPLL and MultiSynth technologies. The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from 'A' or 'C' variants that support up to 1028 MHz. The device combines jitter attenuation with clock multiplication in a single integrated circuit.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5345B-D-GM: Generic blank prototyping device requiring user configuration via ClockBuilder Pro instead of factory preprogramming.