SI5344B-B05421-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5344B-B05421-GMR is a jitter attenuator and clock multiplier from the Si5344 family, manufactured by Skyworks Solutions. It features four inputs and four outputs housed in a 44-QFN package measuring 7x7 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 formats and up to 250 MHz for LVCMOS. It delivers ultra-low jitter of 90 fs rms and 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 fourth-generation DSPLL and MultiSynth technologies.
• Supports free-run, synchronous, and holdover modes with automatic or manual hitless input clock switching.
• Features digitally programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz for optimized performance.
• 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 against the manufacturer's current documentation to confirm factory preprogramming details. Confirm package availability and lead times through authorized distributors. Ensure compliance with RoHS-6 standards and check for moisture sensitivity levels prior to PCB assembly. Validate that the serial interface requirements match the system design constraints.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when low-jitter clock generation is required for high-speed networking applications. The Si5344B variant specifically limits output frequencies to 350 MHz, suitable for SyncE and standard Ethernet interfaces. Utilize ClockBuilder Pro software for configuration. Ensure external crystal specifications meet the 25 to 54 MHz range for optimal jitter performance.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5345/44/42 Rev D family, which combines DSPLL and MultiSynth technologies. The Si5344 model provides four inputs and four outputs, distinguishing it from the ten-output Si5345 and two-output Si5342 variants. All models share similar functional architectures and packaging options.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5344A-D-GMR

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum differential output frequency supported by the Si5344B?

The Si5344B supports differential output frequencies up to 350 MHz.

How does the device handle input clock loss?

The device enters holdover mode if the selected input clock becomes invalid and no other valid inputs are available, using stored historical frequency data to maintain output stability.

Can the device switch between input clocks without glitches?

Yes, the device supports hitless input switching for fractionally related frequencies and glitchless switching for frequencies up to ±500 ppm apart.