SI5345B-B04276-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04276-GMR is a jitter attenuator and clock multiplier from the Si5345 family, manufactured by Skyworks Solutions. It features four inputs and ten outputs housed in a 64-QFN package measuring 9x9 mm. The device supports differential input frequencies from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential signals and up to 250 MHz for LVCMOS. It operates on a core voltage of 1.8 V ±5% and an auxiliary voltage of 3.3 V ±5%, with an operating 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 fourth-generation DSPLL and MultiSynth technologies.
• Provides ultra-low jitter performance of 90 fs rms with digitally programmable jitter attenuation bandwidth.
• Supports hitless input clock switching, free-run modes, and holdover capabilities for high reliability.
• Features highly configurable outputs compatible with LVDS, LVPECL, LVCMOS, CML, and HCSL standards.

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 B04276 suffix against the official datasheet ordering guide. Confirm that the component meets RoHS-6 compliance and Pb-free requirements. Ensure the serial interface settings match the target system's I2C or SPI protocol before integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when applications require ten independent output clocks with frequencies capped at 350 MHz. The device is suitable for designs needing integrated loop filters and non-volatile memory for power-up configurations. Verify that the required input frequencies fall within the specified differential or LVCMOS ranges.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 Rev D series, which combines DSPLL and MultiSynth technologies. The 'B' designation indicates a maximum output frequency limit of 350 MHz, distinguishing it from the 'A' variant which supports higher frequencies. The part is designed for high-performance clock generation in telecommunications and networking infrastructure.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5345B variants such as SI5345B-D-GMR or SI5345B-A-GM, provided the specific preprogrammed frequency plan matches the application requirements. Cross-referencing the exact configuration via ClockBuilder Pro software is necessary to ensure functional equivalence.