SI5345B-B04674-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04674-GM is a factory preprogrammed clock synthesizer and jitter attenuator 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 technology 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 measuring 9x9 mm.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using integer and fractional synthesis.
• Integrates a fully on-chip loop filter to eliminate discrete noise coupling risks.
• Supports hitless input clock switching between fractionally related sources.
• Includes in-circuit programmable non-volatile memory for known power-up configurations.

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

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific B04674 suffix against Skyworks documentation to confirm the exact preprogrammed frequency plan. Factory preprogrammed devices are assigned unique numerical sequences representing their configuration. Confirm availability status as custom parts may have limited distribution channels compared to standard SKUs.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when a fixed 350 MHz maximum output frequency is sufficient for the design. The Si5345B variant offers cost optimization compared to the full-range Si5345A. Ensure the application requires the specific factory-programmed configuration associated with the B04674 suffix rather than a generic blank device.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 Rev D family, which combines DSPLL and MultiSynth technologies. The 'B' designation indicates a restricted output frequency range of up to 350 MHz, distinguishing it from the wider bandwidth Si5345A models. The 'GM' suffix denotes the lead-free QFN-64 package type.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5345B-D-GM

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency for the Si5345B series?

The Si5345B series supports output frequencies up to 350 MHz.

How does the device handle input clock loss?

The device enters holdover mode using stored historical frequency data or free-run mode if no valid inputs are available.

Is the loop filter external or internal?

The loop filter is fully integrated on-chip, removing the need for external components.