SI5345B-B08454-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B08454-GMR is a factory preprogrammed clock synthesizer and jitter cleaner from the Si5345 family. It features four inputs and ten outputs, supporting any-frequency generation up to 350 MHz. The device utilizes fourth-generation DSPLL and MultiSynth technologies for ultra-low jitter performance of 90 fs rms. It operates on a 1.8 V core voltage and 3.3 V analog supply within a -40°C to +85°C temperature range. The component is housed in a 64-QFN package and includes non-volatile memory for configuration retention.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using integer and fractional synthesis.
• Features fully integrated loop filters and digitally programmable jitter attenuation bandwidth for optimized performance.
• Supports free-run, synchronous, and holdover modes with automatic or manual hitless input clock switching.
• Includes in-circuit programmable non-volatile memory ensuring 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 B08454 suffix against Skyworks documentation to confirm the exact preprogrammed frequency plan. Factory preprogrammed devices are assigned unique numerical sequences representing their configuration. Confirm RoHS compliance and moisture sensitivity levels prior to assembly.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a fixed, preconfigured clock solution is required without external programming. Ensure the 350 MHz maximum output frequency meets system requirements. Verify that the 64-QFN package dimensions fit the PCB layout constraints and that the serial interface compatibility matches the host controller.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part 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-frequency variants like the Si5345A. The 'GMR' suffix denotes tape and reel packaging for automated surface-mount assembly.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5345B-D-GMR serves as the base generic variant for custom programming. Other family members include Si5345A-D-GMR for frequencies up to 1028 MHz and Si5344/Si5342 variants with fewer outputs. Direct substitution requires matching the specific preprogrammed frequency configuration.