SI5345B-B00012-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B00012-GMR 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 combination of output frequencies from any input frequency. The device supports differential inputs ranging from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies are configurable from 100 Hz to 350 MHz for differential formats and up to 250 MHz for LVCMOS. It features ultra-low jitter performance of 90 fs rms and meets ITU-T G.8262 SyncE requirements. The component operates within a temperature range of –40 °C to +85 °C and is housed in a 64-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fractional and integer synthesis modes.
• Features fully integrated on-chip loop filter with digitally programmable jitter attenuation bandwidth.
• Supports hitless input clock switching between fractionally related sources without phase offset propagation.
• Includes in-circuit programmable non-volatile memory for known power-up configuration and holdover capabilities.

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) systems
• Carrier Ethernet switches
• SONET/SDH line cards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed configuration associated with the B00012 suffix against the design requirements. Confirm that the 64-QFN package dimensions and thermal characteristics match the PCB layout specifications. Ensure the serial interface protocol (I2C or SPI) matches the system controller capabilities. Validate that the external crystal or reference clock source aligns with the device's input frequency ranges and jitter performance targets.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when ten independent output clocks are required with high-frequency flexibility up to 350 MHz. The Si5345B variant is suitable for applications prioritizing jitter attenuation over the wider frequency range offered by the Si5345A. Consider the integrated NVM if field reprogrammability is needed. Verify that the 64-QFN footprint fits the available board space compared to the smaller 44-QFN options in the Si5344 or Si5342 families.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D family of jitter attenuators. The Si5345 specifically provides four inputs and ten outputs, distinguishing it from the Si5344 (four outputs) and Si5342 (two outputs). All variants share the same core DSPLL technology and package options but differ in channel count and maximum output frequency capabilities defined by their suffix codes.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include the SI5345A-D-GMR for higher frequency support or the SI5345C-D-GMR for integer-only synthesis. For lower pin counts, the SI5344 series offers a compatible interface but with reduced output channels. Cross-family replacement requires verifying register compatibility and software configuration tools.