SI5345A-B04689-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345A-B04689-GMR is a factory preprogrammed clock synthesizer and jitter cleaner from the Si5345 family. It features four inputs and ten outputs, supporting any-frequency generation with integer and fractional synthesis modes. The device operates within an output frequency range of 0.001 to 350 MHz and accepts differential input frequencies up to 750 MHz or LVCMOS inputs up to 250 MHz. It utilizes fourth-generation DSPLL technology for ultra-low jitter performance of 90 fs rms. The component is housed in a 64-QFN package measuring 9x9 mm and supports operating temperatures from -40 to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Combines fourth-generation DSPLL and MultiSynth technologies for high-performance jitter attenuation and any-frequency clock generation.
• Features digitally programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz for optimized application-level performance.
• Supports hitless input clock switching between fractionally related clocks and glitchless on-the-fly output frequency changes.
• 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 suffix B04689 against project requirements. Confirm that the 64-QFN package dimensions and pinout match the PCB footprint. Ensure the serial interface protocol (I2C or SPI) aligns with the system controller capabilities. Check for RoHS compliance documentation if required by regulatory standards.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when applications require ten low-jitter outputs with frequencies capped at 350 MHz. The Si5345A variant supports both integer and fractional synthesis, offering greater flexibility than integer-only options. Consider the integrated loop filter and NVM features to simplify board design and reduce external component count compared to discrete solutions.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5345 Rev D family, which also includes variants like the Si5345B (350 MHz limit) and Si5345C/D (integer-only). The 'GMR' suffix indicates tape and reel packaging. Other family members include the Si5344 (4 outputs) and Si5342 (2 outputs), all sharing similar core functionalities but differing in I/O counts and packages.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same package and specification set are limited due to the unique factory programming. Generic equivalents may include other Skyworks Si5345A models with different output limits or synthesis types, provided the frequency constraints and I/O configurations are compatible.