SI5346B-B-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5346B-B-GM is a dual DSPLL jitter attenuator and clock synthesizer from Skyworks Solutions, packaged in a 44-lead QFN (7x7 mm). It features two independent DSPLLs with four inputs and four outputs. The device supports any-frequency conversion with an output frequency range up to 350 MHz for the B-grade variant. Key electrical parameters include a core supply voltage of 1.8 V ±5% and an I/O supply of 3.3 V ±5%. It operates within a temperature range of -40°C to +85°C and delivers ultra-low jitter performance of 95 fs typ (12 kHz – 20 MHz).

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates two independent DSPLLs for flexible timing path generation.
• Supports hitless input clock switching between frequency-locked sources.
• Includes automatic holdover modes to maintain timing during input loss.
• Features programmable loop bandwidths for optimized jitter attenuation.

Clock Generators, PLLs, Frequency Synthesizers Applications

• OTN Muxponders and Transponders
• 10/40/100G network line cards
• GbE/10 GbE/100 GbE Synchronous Ethernet (ITU-T G.8262)
• Carrier Ethernet switches
• Broadcast video

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature grade. Confirm RoHS compliance status as manufacturing processes may evolve. Check for availability of factory pre-programmed variants if specific configurations are required instead of blank devices.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when dual independent PLLs are sufficient for the design. Compare against the Si5347A/B if eight outputs or quad PLLs are needed. Ensure the 350 MHz maximum output frequency meets system requirements. Verify that the 44-QFN package footprint fits the PCB layout constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5346 family, which serves as the dual-DSPLL counterpart to the Si5347 quad-DSPLL series. Both share similar architectural features but differ in pin count and output capacity. The Si5346 is designed for applications requiring high integration in a smaller form factor compared to the larger Si5347.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5346A-D-GM offers a higher output frequency range up to 720 MHz. Si5347B-D-GM provides four DSPLLs and eight outputs in a larger package. Verify pin compatibility and software configuration differences before substitution.