SI5345B-B03375-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5345B-B03375-GM is a low-jitter, 10-output clock synthesizer and jitter attenuator from the Si5345 family. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any frequency combination up to 350 MHz from any input source. The device features four inputs (differential or LVCMOS) and ten highly configurable outputs supporting LVDS, LVPECL, LVCMOS, CML, and HCSL formats. Key electrical parameters include a maximum output frequency of 350 MHz, an operating temperature range of -40°C to +85°C, and supply voltages of VDD at 1.8V ±5% and VDDA at 3.3V ±5%. It 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 with integrated loop filter and digitally programmable attenuation bandwidth.
• Supports hitless input clock switching, free-run modes, and holdover capabilities for high reliability.
• Includes in-circuit programmable non-volatile memory for known power-up configurations.

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 suffix B03375, as this part number represents a custom device rather than a blank prototyping unit. Confirm that the required frequency plan matches the internal NVM data. Since this is a specialized component, availability may be limited compared to standard SKUs. Ensure compatibility with ClockBuilder Pro software for any necessary post-manufacturing adjustments if supported by the specific revision.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the SI5345B variant when the application requires output frequencies strictly below 350 MHz. This model provides 10 outputs within a 64-QFN package, suitable for dense designs. Verify that the input sources are compatible with the differential or LVCMOS requirements. For applications requiring higher output frequencies up to 1028 MHz, consider the Si5345A or Si5345C variants instead. Ensure the design accommodates the separate VDD and VDDA power supplies.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 family of jitter attenuators, which also includes the Si5344 (4 outputs) and Si5342 (2 outputs). The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from the 'A' and 'C' variants that support up to 1028 MHz. The 'GM' suffix denotes the lead-free, RoHS-compliant 64-QFN package. The numerical suffix identifies a unique factory-programmed frequency configuration.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same package and pinout include other Si5345B variants such as SI5345B-A-GM or SI5345B-D-GM, provided their factory configurations match the system requirements. For applications needing higher frequencies, the Si5345A-D-GM is a compatible alternative. If fewer outputs are sufficient, the Si5344 series offers a smaller footprint but different pin counts.