SI5345B-B05451-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B05451-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 signals and up to 250 MHz for LVCMOS outputs. 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 digitally programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz for optimized performance.
• Supports hitless input clock switching between fractionally related clocks and glitchless on-the-fly frequency changes.
• Includes in-circuit programmable non-volatile memory (NVM) 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 ordering suffix B05451 against the manufacturer's current documentation to confirm factory preprogrammed configurations. Ensure compatibility with I2C or SPI serial interfaces during integration. Confirm that the 64-QFN package dimensions align with the target PCB land pattern. Validate that the required supply voltages (VDD 1.8 V and VDDA 3.3 V) are available within specified tolerances.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when applications require up to ten independent output clocks with jitter attenuation capabilities below 350 MHz. The Si5345B variant is suitable for designs prioritizing low jitter performance over the higher frequency ranges offered by the Si5345A series. Consider the integrated loop filter and NVM features if minimizing external components and ensuring boot-time stability are critical design constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D family of jitter attenuators. The Si5345 variant 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 and MultiSynth architecture but differ in pin count and output capacity.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include the Si5345A-D-GM1/R and Si5345C-D-GM1/R for higher frequency ranges, or the Si5345D-D-GM1/R for integer-only synthesis. Verify pinout compatibility and software configuration migration when substituting these models.