SI5345B-B05954-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B05954-GM is a factory preprogrammed clock synthesizer and jitter attenuator from the Si5345 family. It features four inputs and ten outputs, supporting any-frequency generation up to 350 MHz. The device utilizes fourth-generation DSPLL technology for ultra-low jitter performance of 90 fs rms. It operates on a single 1.8 V core voltage and accepts differential inputs from 8 kHz to 750 MHz or LVCMOS inputs from 8 kHz to 250 MHz. Outputs are configurable as LVDS, LVPECL, LVCMOS, CML, or HCSL. The component is housed in a 64-QFN package and functions within a 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 integer and fractional synthesis.
• Provides ultra-low jitter attenuation with a programmable bandwidth ranging from 0.1 Hz to 4 kHz.
• Supports hitless input clock switching between fractionally related sources without phase offset propagation.
• Includes in-circuit programmable non-volatile memory to ensure known frequency configuration upon power-up.

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 B05954 suffix against project requirements before procurement. As this is a custom part number assigned by Skyworks, standard generic devices cannot substitute for the exact frequency plan. Confirm availability through authorized distributors, noting that lead times may vary significantly for preprogrammed units compared to blank prototypes.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the SI5345B variant specifically when output frequencies must remain below 350 MHz. Ensure the design accommodates the 64-QFN 9x9 mm package footprint and thermal requirements. Use ClockBuilder Pro software to validate the preprogrammed settings if modifications are needed, though factory parts typically lock these configurations. Verify that the required input/output signal formats match the supported LVDS, LVPECL, LVCMOS, CML, and HCSL options.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 Rev D family, which integrates DSPLL and MultiSynth technologies. The 'B' designation indicates the 350 MHz maximum output frequency limit, distinguishing it from the 'A' and 'C' variants that support higher frequencies up to 1028 MHz. The 'D' suffix denotes the Rev D silicon revision. The 'GM' suffix identifies the RoHS-compliant QFN package type.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements include other Si5345B-D-GM variants with different preprogrammed configurations. Generic Si5345A-D-GM or Si5345C-D-GM devices can replace this part only if the application requires frequencies exceeding 350 MHz and does not require the specific B05954 frequency plan. Blank Si5345B-D-GM parts require reprogramming to function identically.