SI5347C-B04928-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The Si5347C-B04928-GMR is a quad DSPLL jitter attenuator and clock multiplier from Skyworks Solutions. It integrates four independent DSPLLs within a 64-lead QFN package, supporting up to eight outputs with frequencies ranging from 100 Hz to 720 MHz. The device accepts differential inputs from 8 kHz to 750 MHz and LVCMOS inputs from 8 kHz to 250 MHz. It delivers ultra-low jitter performance of 95 fs rms (12 kHz–20 MHz) and supports flexible input-to-output crosspoint routing. Key operational modes include free-run, holdover, and hitless switching, with configuration managed via I2C or SPI serial interfaces.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates four independent DSPLLs for any-frequency conversion and jitter attenuation
• Supports flexible crosspoint routing connecting any input to any output
• Provides automatic and manual hitless input clock switching capabilities
• Features programmable holdover modes with glitchless frequency transitions

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 systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm factory pre-programmed configurations. Ensure compatibility with ClockBuilder Pro software settings for the designated numerical sequence ID. Confirm package type and temperature range specifications match the design requirements before finalizing procurement orders.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when multiple independent timing paths are required within a single package. The Si5347C variant supports output frequencies up to 720 MHz, suitable for high-speed digital applications. Consider the available input formats and the need for low jitter performance below 100 fs. Evaluate the requirement for holdover functionality and hitless switching features during system design.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5347 family, which utilizes fourth-generation DSPLL technology. The 'C' designation indicates support for output frequencies up to 720 MHz, distinguishing it from lower-frequency variants. The 'B' grade specifies particular electrical characteristics within the Rev D product line. The '-GMR' suffix denotes tape and reel packaging options for automated assembly processes.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5347A-D-GMR

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the typical jitter performance of the Si5347C?

The device provides an ultra-low jitter performance of 95 fs rms within the frequency range of 12 kHz to 20 MHz.

How does the device handle input clock failures?

The Si5347C automatically enters Holdover Mode using stored historical frequency data if the selected input clock becomes invalid, ensuring continuous operation without interruption.

Can the device switch between inputs without glitches?

Yes, the device supports both hitless switching for frequency-locked inputs and glitchless switching for inputs with slight frequency differences, preventing runt pulses at the output.