SI5345B-B03779-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5345B-B03779-GM is a factory preprogrammed clock multiplier and jitter attenuator from the Si5345 family. It features four inputs and ten outputs, supporting any-frequency generation up to 350 MHz with integer and fractional synthesis modes. The device utilizes fourth-generation DSPLL technology to achieve ultra-low jitter performance of 90 fs rms. It operates on a core voltage of 1.8 V ±5% and an analog supply of 3.3 V ±5%. The component is housed in a 64-QFN package measuring 9x9 mm and supports operation 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.
• Features programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz for optimized performance.
• Supports hitless input clock switching between fractionally related clocks 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 B03779 suffix against project requirements. Confirm that the QFN-64 package dimensions align with the PCB land pattern design. Ensure the serial interface connections match the I2C or SPI protocol selected during the initial ClockBuilder Pro configuration process.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when ten independent output clocks are required with frequencies up to 350 MHz. The Si5345B variant is appropriate for applications not requiring the higher 1028 MHz output capability of the Si5345A/C variants. Verify that the input frequency range fits within the differential 8 kHz to 750 MHz or LVCMOS 8 kHz to 250 MHz specifications provided in the datasheet.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D family of jitter attenuators. The Si5345 series specifically provides four inputs and ten outputs in a 64-QFN package. Other family members include the Si5344 with four outputs and the Si5342 with two outputs, both in smaller 44-QFN packages. All share similar internal DSPLL and MultiSynth technologies.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same package and pinout include other factory preprogrammed Si5345B devices such as SI5345B-Dxxxxx-GM. For different output counts, consider the Si5344B or Si5342B series. Higher frequency variants like the Si5345A-D require verification of electrical compatibility.