SI5344A-B04903-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5344A-B04903-GMR is a factory preprogrammed, low-jitter clock multiplier and jitter attenuator belonging to the Si5344 family. It features four inputs and four outputs housed in a 44-QFN package. The device utilizes fourth-generation DSPLL and MultiSynth technologies to generate any combination of output frequencies from any input frequency. It supports integer and fractional synthesis modes with an output frequency range up to 1028 MHz for differential outputs. Key electrical parameters include a core voltage (VDD) of 1.8 V ±5% and an analog supply (VDDA) of 3.3 V ±5%. The unit operates within a temperature range of –40 to +85 °C and includes in-circuit programmable non-volatile memory.

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.
• Supports hitless input clock switching between fractionally related inputs.
• Includes in-circuit programmable non-volatile OTP 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 B04903 suffix against project requirements before procurement. Confirm that the 44-QFN 7x7 mm package dimensions are compatible with the target PCB land pattern. Ensure the serial interface protocol matches the system controller capabilities.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when high-frequency flexibility up to 1028 MHz is required alongside ultra-low jitter specifications. The Si5344A variant supports both integer and fractional synthesis, distinguishing it from lower-tier models. Verify that the 4-input, 4-output topology meets the system's clock distribution needs compared to the Si5342 or Si5345 families.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component is part of the Si5345/44/42 Rev D family, which combines DSPLL and MultiSynth technologies. The Si5344 specifically offers a 4-input, 4-output configuration in a compact 44-QFN package. It is designed for applications requiring precise clock generation and jitter attenuation with digital programmability via I2C or SPI interfaces.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Factory preprogrammed devices have unique numerical sequences representing their specific configurations, making direct pin-for-pin functional replacements difficult without reprogramming.