SI5345B-B03321-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B03321-GM is a clock synthesizer and jitter cleaner from the Si5345 family, manufactured by Skyworks Solutions. It features four inputs and ten outputs housed in a 64-QFN package measuring 9x9 mm. The device supports differential input frequencies up to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential formats (LVDS, LVPECL, CML) and up to 250 MHz for LVCMOS. It operates on a core voltage of 1.8 V ±5% and an I/O voltage of 3.3 V ±5%, with independent output supply options at 3.3 V, 2.5 V, or 1.8 V. The operating temperature range is -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 against the manufacturer's current documentation to confirm factory preprogramming details. Confirm package availability and lead times directly with authorized distributors as stock levels fluctuate. Ensure the serial interface configuration matches the target system requirements before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when high channel count and low jitter are required for synchronization applications. Verify that the maximum output frequency of 350 MHz meets the design specifications. Ensure the system can accommodate the 64-QFN package dimensions and thermal requirements within the specified operating temperature range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5345 Rev D series, which combines DSPLL and MultiSynth technologies for flexible clock generation. The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from higher-frequency variants like the Si5345A. The 'GM' suffix denotes a lead-free, RoHS-6 compliant package suitable for standard surface-mount assembly processes.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5345B variants such as SI5345B-D12121-GM or SI5345B-D11416-GM, provided the factory preprogrammed configuration matches the application needs. Cross-referencing with the Si5345A series is possible if higher output frequencies are acceptable.