SI5345B-B05852-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5345B-B05852-GM is a factory preprogrammed clock synthesizer and jitter attenuator from the Si5345 Rev D family. It features four inputs and ten outputs, supporting any-frequency generation up to 350 MHz. The device integrates fourth-generation DSPLL and MultiSynth technologies for ultra-low jitter performance of 90 fs rms. It operates on a single 1.8 V core supply and accepts differential or LVCMOS inputs ranging from 8 kHz to 750 MHz. Outputs are configurable as LVDS, LVPECL, LVCMOS, CML, or HCSL. The component is housed in a 64-QFN (9x9 mm) package and functions within a 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 hitless input clock switching between fractionally related sources without propagating phase offsets.
• Supports free-run, holdover, and locked modes with programmable jitter attenuation bandwidth.
• 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 factory preprogrammed configuration associated with the B05852 suffix against project requirements. Confirm that the QFN-64 package dimensions match the PCB land pattern. Ensure the serial interface connections align with the I2C or SPI control specifications. Check for moisture sensitivity handling during storage and assembly.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when low jitter performance below 350 MHz is required alongside multiple output formats. The integrated loop filter reduces noise coupling risks compared to discrete solutions. Use ClockBuilder Pro software to verify the preprogrammed settings if modifications are needed. Consider the 1.8 V core voltage requirement for power budget calculations.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 Rev D series, which combines DSPLL and MultiSynth technologies. The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from higher-speed variants like the Si5345A. The 'GM' suffix denotes the lead-free, RoHS-compliant QFN package type used across the family.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5345B-D-GM variants with different preprogrammed configurations. Verify that the replacement maintains the same 10-output count and 350 MHz frequency limit. Ensure the new part supports the required input/output signal formats and operating temperature range.