SI5345B-B04944-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04944-GM is a low-jitter, 10-output clock synthesizer and jitter attenuator from Skyworks Solutions. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any frequency combination from any input source. The device supports differential inputs up to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential formats and 100 Hz to 250 MHz for LVCMOS. It 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 integer and fractional synthesis.
• Features 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 for high reliability.
• Includes highly configurable outputs compatible with LVDS, LVPECL, LVCMOS, CML, and HCSL signal standards.

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 B04944 suffix against the official Skyworks datasheet or ClockBuilder Pro software. Confirm that the required operating voltage levels and external crystal specifications match the design requirements before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when applications require a single device to provide multiple clock outputs with varying frequencies derived from different input sources. Ensure the design accommodates the 64-QFN package dimensions and thermal dissipation characteristics specified in the datasheet.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5345 family of jitter attenuators, which are designed for high-performance timing applications. The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from higher-frequency variants within the same series.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements must be sought from the Si5345 family. Verify pin compatibility and output frequency ranges. Factory preprogrammed parts may require reconfiguration via ClockBuilder Pro if the new unit does not share the exact same internal settings.