SI5345B-B05785-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B05785-GM is a clock synthesizer and jitter cleaner from the Si5345 family, manufactured by Skyworks Solutions Inc. It features four inputs and ten outputs housed in a 64-QFN package measuring 9x9 mm. The device supports differential input frequencies from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential formats and up to 250 MHz for LVCMOS. It operates on a core voltage of 1.8 V ±5% and an auxiliary supply of 3.3 V ±5%, with an operating temperature range of -40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fourth-generation DSPLL and MultiSynth technologies
• Provides ultra-low jitter performance of 90 fs rms with digitally programmable jitter attenuation bandwidth
• Supports hitless input clock switching, free-run modes, and holdover capabilities with automatic or manual selection

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 ordering suffix B05785 against the manufacturer's current documentation to confirm factory preprogramming details. Confirm availability status as custom part numbers may have restricted distribution channels. Ensure compatibility with ClockBuilder Pro software versions for configuration validation before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when requiring ten configurable outputs with low jitter attenuation capabilities. Verify that the 350 MHz maximum output frequency meets system requirements. Ensure the 64-QFN package footprint fits the PCB layout constraints. Confirm support for required input signal formats including differential and LVCMOS options.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the Si5345/44/42 Rev D family of jitter attenuators and clock multipliers. It shares architectural similarities with the Si5344 and Si5342 but offers a higher channel count with four inputs and ten outputs. The family utilizes integrated loop filters and non-volatile memory for configuration storage.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include other Si5345 variants such as SI5345A-D-GM or SI5345C-D-GM, depending on whether integer-only or fractional synthesis is required. Verify pinout compatibility and output frequency ranges when substituting.