SI5345B-B04534-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345B-B04534-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 integer and fractional frequency synthesis with an output range of 0.001 to 350 MHz. Input frequencies are accepted differentially from 8 kHz to 750 MHz or via LVCMOS from 8 kHz to 250 MHz. Operating voltages include VDD at 1.8 V ±5% and VDDA at 3.3 V ±5%. The component operates within a temperature range of -40 to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Combines fourth-generation DSPLL and MultiSynth technologies for any-frequency generation and jitter attenuation
• Features programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz
• Supports hitless input switching between fractionally related clocks
• 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 factory preprogrammed configuration associated with the B04534 suffix against the official datasheet ordering guide. Confirm that the required NVM data matches the intended application design before procurement. Ensure compatibility with ClockBuilder Pro software settings for the designated frequency plan.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when ultra-low jitter performance near 90 fs rms is required alongside flexible output formatting. The Si5345B variant specifically limits output frequencies to 350 MHz, distinguishing it from higher-speed A or C variants. Verify that the 64-QFN package dimensions fit the target PCB land pattern constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D series, which utilizes Skyworks' proprietary MultiSynth architecture. The 'B' designation indicates a maximum output frequency limit of 350 MHz, whereas other letters denote different speed grades. The part integrates a fully on-chip loop filter to minimize noise coupling risks found in discrete solutions.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same package and pinout include other Si5345B variants such as SI5345B-D-GM or SI5345B-A-GM, provided the frequency requirements align. Note that changing the middle letter alters the maximum supported output frequency range.