SI5345B-B04236-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04236-GMR is a 10-channel jitter attenuator and clock multiplier from Skyworks Solutions. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any combination of output frequencies from any input frequency. The device supports differential inputs up to 750 MHz and LVCMOS inputs up to 250 MHz, with output frequencies ranging from 100 Hz to 350 MHz for the B-series variant. It features an integrated loop filter, programmable jitter attenuation bandwidth, and in-circuit programmable non-volatile memory. The component operates within a temperature range of -40°C to +85°C and is housed in a 64-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fractional and integer synthesis modes.
• Features ultra-low jitter performance of 90 fs rms with digitally programmable jitter attenuation bandwidth.
• Supports hitless input clock switching between fractionally related clocks and glitchless on-the-fly output frequency changes.
• Includes in-circuit programmable non-volatile memory for known power-up configuration and status monitoring capabilities.

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 numerical suffix before procurement. Confirm that the required output frequency range aligns with the B-series limitation of 350 MHz maximum output frequency. Ensure compatibility with the 64-QFN package dimensions and thermal requirements for the target application design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when high channel count and low jitter are required for synchronous Ethernet or OTN applications. The B-series designation indicates a maximum output frequency of 350 MHz; verify if higher frequencies necessitate the A or C series variants. Consider the availability of ClockBuilder Pro software for configuring the serial interface and NVM settings prior to integration.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 family of jitter attenuators, which also includes the Si5344 and Si5342 variants. The Si5345 specifically offers four inputs and ten outputs in a 64-QFN package, distinguishing it from the lower channel counts of the Si5344 and Si5342 models while sharing the same core DSPLL technology.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5345A-D-GMR provides support for output frequencies up to 1028 MHz. Si5345C-D-GMR offers integer-only synthesis up to 1028 MHz. Si5345D-D-GMR supports integer synthesis up to 350 MHz. Verify functional equivalence regarding output frequency limits and synthesis modes when substituting.