SI5345B-B04795-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04795-GM is a factory preprogrammed clock synthesizer 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 and MultiSynth technologies to achieve ultra-low jitter performance of 90 fs rms. It operates within a temperature range of -40°C to +85°C and is housed in a 64-QFN package measuring 9x9 mm.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Combines fourth-generation DSPLL and MultiSynth technologies for high-performance jitter attenuation and frequency multiplication.
• Supports free-run, synchronous, and holdover modes with automatic or manual input clock switching capabilities.
• Features fully integrated on-chip loop filter and digitally programmable jitter attenuation bandwidth.
• 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 B04795 suffix against project requirements using ClockBuilder Pro software. Confirm that the 350 MHz output frequency limit aligns with system specifications. Ensure compatibility with the 64-QFN 9x9 mm package footprint during PCB layout review.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when an ultra-low jitter solution is required for applications needing up to ten independent output frequencies derived from various input sources. The Si5345B variant specifically supports frequencies up to 350 MHz, distinguishing it from higher-frequency A/C variants. Verify that the single PLL architecture meets the phase noise requirements of the target application.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 Rev D family of jitter attenuators. It shares the same physical package and core architecture as other Si5345 models but differs in its factory-programmed frequency plan and specific output frequency range limitations defined by the 'B' designation.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements include other Si5345B-D-xxxxx-GM variants with different preprogrammed configurations. For pin-compatible upgrades requiring higher frequencies, consider Si5345A-D-xxxxx-GM or Si5345C-D-xxxxx-GM models, provided the frequency constraints are met.