SI5342D-B04021-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5342D-B04021-GMR is a jitter attenuator and clock multiplier from the Si5342 Rev D family, manufactured by Skyworks Solutions Inc. It features four inputs and two outputs housed in a 44-QFN 7x7 mm package. 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 achieves 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 technology.
• Supports free-run, synchronous, and holdover modes with automatic or manual input clock switching.
• Features digitally programmable jitter attenuation bandwidth for optimized performance at the application level.
• Includes in-circuit programmable non-volatile memory 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 tape and reel packaging versus tray options. Ensure the part number matches the exact Rev D silicon revision required for your design. Confirm that the factory preprogrammed configuration aligns with your system requirements before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a low-pin-count solution with two differential outputs is required. The Si5342D variant specifically limits the maximum output frequency to 350 MHz, distinguishing it from higher-frequency variants. Verify that the 44-QFN package dimensions fit the PCB layout constraints and that the serial interface compatibility meets the system controller specifications.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the Si5345/44/42 Rev D family, which utilizes MultiSynth and DSPLL technologies. While the Si5345 offers ten outputs and the Si5344 offers four, the Si5342 provides a compact two-output option. All variants share similar core functionalities, including glitchless frequency changes and comprehensive fault monitoring capabilities.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The Si5342B-D-GMR serves as a functional alternative within the same family, offering identical pinout and feature sets but supporting output frequencies up to 1028 MHz instead of the 350 MHz limit found in the Si5342D variant. Ensure voltage and frequency requirements are met when substituting.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency supported by the Si5342D variant?

The Si5342D variant supports a maximum differential output frequency of 350 MHz and an LVCMOS output frequency of 250 MHz.

How does the device handle input clock failures?

The device monitors inputs for Loss of Signal (LOS) and Out-of-Frequency (OOF). If the selected input fails and no other valid inputs are available, it automatically enters holdover mode using stored historical data.

Can the device switch between input clocks without glitches?

Yes, the device supports hitless switching for fractionally related inputs and glitchless switching for inputs with frequency differences up to ±500 ppm.