SI5344B-B05370-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5344B-B05370-GMR is a low-jitter, four-output jitter attenuator and clock multiplier from the Si5344 family. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any output frequency from any input frequency. The device supports differential inputs up to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range 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, programmable loop bandwidth, and in-circuit programmable non-volatile memory. The component operates 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 integer and fractional synthesis.
• Provides ultra-low jitter attenuation with a digital loop filter fully integrated on-chip.
• Supports hitless input clock switching between fractionally related sources.
• Includes in-circuit programmable non-volatile 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 ordering suffix against the manufacturer's current documentation to confirm package type and tape-and-reel specifications. Confirm that the factory preprogrammed configuration matches the required frequency plan, as custom part numbers are assigned by Skyworks based on ClockBuilder Pro software settings. Ensure compatibility with I2C or SPI control interfaces during integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when an output frequency limit of 350 MHz is sufficient, distinguishing it from the higher-frequency Si5344A variant which supports up to 1028 MHz. Verify that the four-input, four-output architecture meets system requirements. Ensure the design accommodates the 44-QFN 7x7 mm package dimensions and thermal characteristics specified in the datasheet.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5344 family of jitter attenuators, which also includes the Si5344A (up to 1028 MHz), Si5344C (integer-only), and Si5344D variants. All share the same 44-QFN package and core DSPLL technology but differ in maximum output frequency capabilities and synthesis modes. The 'B' designation indicates the 350 MHz output class.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5344A-Dxxxxx-GMR offers higher frequency support up to 1028 MHz. Si5344C-Dxxxxx-GMR provides integer-only synthesis. Si5344D-Dxxxxx-GMR is another 350 MHz option. Verify pinout and register compatibility before substitution.