SI5342C-A-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5342C-A-GMR is a jitter attenuator and clock multiplier from the Si5345/44/42 family, featuring two outputs and four inputs in a 44-QFN package. It supports integer-only synthesis with output frequencies ranging from 100 Hz to 1028 MHz for differential signals and up to 250 MHz for LVCMOS. Input frequencies range from 8 kHz to 750 MHz (differential) or 250 MHz (LVCMOS). The device achieves ultra-low jitter of 90 fs rms and operates on core voltages of 1.8 V and 3.3 V 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 hitless input clock switching between fractionally related clocks without phase offset propagation
• Includes programmable holdover mode that utilizes historical frequency data to maintain stability during input loss
• Features integrated loop filter and digitally programmable bandwidth for optimized jitter performance

Clock Generators, PLLs, Frequency Synthesizers Applications

• OTN muxponders and transponders
• 10/40/100 G networking line cards
• GbE/10 GbE/100 GbE Synchronous Ethernet applications
• 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 requirements. Ensure the selected part number matches the required integer-only synthesis capability and output count. Confirm factory preprogramming options if specific frequency configurations are needed prior to installation.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when only two output clocks are required, reducing complexity compared to higher-output variants. Verify that the application requires integer-only synthesis, as fractional modes are not supported in this specific model variant. Ensure the design accommodates the 44-QFN package dimensions and thermal requirements for the specified operating temperature range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the Si5345/44/42 Rev D family, which shares common internal architecture including the MultiSynth dividers and DSPLL engine. Unlike the Si5344 or Si5345, the Si5342 is limited to two outputs while retaining four inputs. All models utilize the same ClockBuilder Pro software for configuration and share similar electrical characteristics regarding jitter and power supply specifications.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5342A-D-GMR provides identical functionality but supports both integer and fractional synthesis modes instead of integer-only.