SI5345B-B04756-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04756-GM is a 10-output jitter attenuator and clock multiplier from the Si5345 family, manufactured by 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, with output frequencies ranging from 100 Hz to 350 MHz for differential formats. It operates on a 1.8 V core voltage and 3.3 V I/O supply, housed in a 64-QFN package measuring 9x9 mm. The component meets ITU-T G.8262 SyncE requirements and features programmable jitter attenuation bandwidth.

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 loop bandwidth.
• Supports hitless input clock switching between fractionally related sources.
• Includes in-circuit programmable non-volatile memory for known power-up configuration.

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 B04756 suffix against the official Skyworks ordering guide or datasheet revision D. Confirm that the required serial interface protocol (I2C or SPI) and voltage levels match the target system design before integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when ten independent output clocks are required with frequencies capped at 350 MHz. Ensure the application benefits from the integrated loop filter and NVM capabilities. Verify compatibility with ClockBuilder Pro software for generating the necessary register map and configuration files.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 family, which also includes the Si5344 (4 outputs) and Si5342 (2 outputs). All variants share similar internal architectures but differ in pin count and output capacity. The Si5345 specifically provides the highest channel density within this low-jitter series.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional substitutes within the same package include other Si5345 variants such as SI5345A-D-GM or SI5345C-D-GM, provided the frequency range and synthesis mode (integer/fractional) requirements align with the new part's specifications.