SI5342A-B04155-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5342A-B04155-GM is a jitter attenuator and clock multiplier featuring four inputs and two outputs in a 44-QFN package. It supports differential input frequencies from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 1028 MHz for differential signals and up to 250 MHz for LVCMOS. The device operates on a core voltage of 1.8 V ±5% and an auxiliary supply of 3.3 V ±5%, with independent output supplies configurable at 3.3 V, 2.5 V, or 1.8 V. It functions 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 and manual input clock switching capabilities.
• Features fully integrated loop filters and digitally programmable jitter attenuation bandwidth for optimized performance.
• 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
• 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 package type and tape-and-reel availability. Confirm that the factory preprogrammed configuration matches the required frequency plan, as custom part numbers are assigned based on unique numerical sequences representing the configuration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when only two output clocks are required, distinguishing it from the Si5344 (four outputs) and Si5345 (ten outputs). Ensure the application requires integer and fractional synthesis modes, as indicated by the 'A' suffix. Verify that the 44-QFN 7x7 mm package fits the PCB land pattern constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 family of jitter attenuating clock multipliers. While sharing identical internal architecture and features, the Si5342 variant is specifically configured with two output channels. This reduction in output count allows for a smaller 44-QFN 7x7 mm package compared to the larger packages used by higher-output variants.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5342 variants such as Si5342B-D-GM, Si5342C-D-GM, and Si5342D-D-GM, which share the same package and pinout but differ in supported frequency ranges or synthesis modes.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency for differential signals?

The maximum output frequency for differential signals is 1028 MHz.

How does the device handle input clock failure?

The device automatically enters holdover mode if the selected input clock becomes invalid and no other valid inputs are available, utilizing stored historical frequency data.

Can the device switch between input clocks without glitches?

Yes, it supports hitless switching for fractionally related inputs and glitchless switching for inputs differing by up to ±500 ppm.