SI5351C-B04998-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5351C-B04998-GMR is an I2C-programmable CMOS clock generator featuring a MultiSynth fractional divider architecture. It synchronizes to an external reference clock (CLKIN) and generates up to eight non-integer-related frequencies ranging from 2.5 kHz to 200 MHz with 0 ppm error. The device operates on a core supply voltage of 2.25 V to 3.6 V and supports output voltages of 1.8 V, 2.5 V, or 3.3 V. It provides low period jitter of less than 70 ps peak-to-peak typical value and includes configurable spread spectrum capabilities.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• I2C programmable configuration for generating any frequency up to 200 MHz
• Synchronizes to an external reference clock input (CLKIN)
• Configurable spread spectrum modulation selectable at each output
• Glitchless frequency changes and adjustable output delay

Clock Generators, PLLs, Frequency Synthesizers Applications

• XO replacement in cost-sensitive designs
• Servers and storage systems
• Networking and communication equipment
• Residential gateways

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed frequency plan associated with the B04998 suffix using ClockBuilder Pro software. Confirm that the CLKIN reference signal meets the required voltage levels and frequency range specifications before integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this variant when synchronization to an external reference clock is required. Ensure the design accommodates the separate core and output supply pins for level translation. Verify package availability matches the required pin count and thermal performance needs.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family, which includes variants A, B, and C. The 'C' designation indicates support for an external reference clock input. The 'B' indicates the -B package type, typically the 20-QFN form factor offering eight outputs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5351C-B-GM

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the function of the CLKIN pin?

The CLKIN pin serves as the external reference clock input for the PLLs, allowing the device to generate synchronous clock outputs.

Can the device generate multiple unique frequencies above 112.5 MHz simultaneously?

No, only two unique frequencies above 112.5 MHz can be output simultaneously, though copies of these frequencies can be distributed across multiple outputs.

How is the output drive strength configured?

The output drive strength is configurable via I2C registers, allowing adjustment of rise/fall times and impedance to match load requirements.