SI5345D-B04494-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345D-B04494-GM is a factory preprogrammed clock synthesizer and jitter cleaner from Skyworks Solutions. It features four inputs and ten outputs, supporting output frequencies up to 350 MHz with differential signaling. The device operates on a single 1.8 V core supply (VDD) and accepts input frequencies ranging from 8 kHz to 750 MHz for differential signals. It utilizes fourth-generation DSPLL technology to achieve ultra-low jitter performance of 90 fs rms. The component is housed in a 64-QFN package measuring 9x9 mm and functions 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 fractional synthesis.
• Integrates non-volatile memory to ensure known frequency configuration upon power-up.
• Supports hitless input clock switching between fractionally related sources.
• Includes programmable jitter attenuation bandwidth for application-level optimization.

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 B04494 suffix against the manufacturer's current documentation to confirm the exact preprogrammed frequency plan. Factory preprogrammed devices are assigned unique numerical sequences representing their configuration. Ensure compatibility with the required serial interface protocol and check for any obsolescence notices from Skyworks Solutions.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when an output frequency limit of 350 MHz is sufficient, as higher-frequency variants like the Si5345A exist. Confirm that the 64-QFN package footprint fits the PCB layout constraints. Verify that the required input/output signal formats (LVDS, LVPECL, etc.) align with the system design requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5345 family of 10-channel jitter attenuators. The 'D' designation indicates support for output frequencies up to 350 MHz, distinguishing it from the 'A' and 'C' variants which support up to 1028 MHz. The 'B04494' suffix identifies a specific factory-programmed configuration rather than a generic functional variant.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5345A-D-GM offers higher frequency support up to 1028 MHz. Si5345B-D-GM provides similar functionality but may require custom programming if the B04494 configuration is not available. Si5344D-D-GM is a pin-compatible alternative with only four outputs.