SI5342D-B04021-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5342D-B04021-GM 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 an 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 ranging from 0.1 Hz to 4 kHz.
• Includes in-circuit programmable non-volatile memory for known power-up configuration.

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 B04021 against official Skyworks documentation to confirm factory preprogrammed configuration details. Confirm current availability status as distribution channels may list this part as discontinued or limited supply. Ensure compatibility with ClockBuilder Pro software for final configuration validation before deployment.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the SI5342 variant when only two output clocks are required, distinguishing it from the four-output Si5344 or ten-output Si5345 models. The 'D' suffix indicates support for output frequencies up to 350 MHz; choose 'A' or 'C' variants if frequencies exceeding 350 MHz or integer-only synthesis are needed. Verify that the 44-QFN package footprint meets PCB layout constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D series, which integrates MultiSynth and DSPLL technologies. The Si5342 specifically provides a compact solution with four inputs and two outputs. It is designed for high-performance timing applications requiring low jitter and flexible frequency generation capabilities across various industrial and telecommunications standards.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional substitutes within the same package include SI5342A-D-GM, SI5342B-D-GM, and SI5342C-D-GM. These variants differ primarily in maximum output frequency ranges and synthesis mode support (integer vs. fractional). Cross-family replacements like the SI5344 offer more outputs but require pinout and firmware adjustments.