SI5350A-B04942-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5350A-B04942-GMR is a factory-programmable CMOS clock generator manufactured by Skyworks Solutions. It utilizes a PLL and high-resolution fractional divider architecture to generate up to eight non-integer-related frequencies ranging from 2.5 kHz to 200 MHz with 0 ppm error. The device operates on a single supply voltage of 1.8 V, 2.5 V, or 3.3 V, with typical core current consumption of 25 mA. It supports configurable spread spectrum for EMI reduction and features low output period jitter typically below 70 ps pp. The component is housed in a 20-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates multiple independent clock frequencies from a single crystal reference
• Supports glitchless frequency transitions via programmable control pins
• Configurable spread spectrum modulation to reduce electromagnetic interference
• Provides separate voltage supplies for core logic and output buffers

Clock Generators, PLLs, Frequency Synthesizers Applications

• HDTV and Blu-ray player systems
• Set-top boxes and residential gateways
• Servers and storage equipment
• Networking and communication infrastructure

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory programming configuration associated with the B04942 suffix using ClockBuilder Pro software. Confirm that the 20-QFN package dimensions and thermal requirements align with the target PCB layout. Ensure the external crystal matches the specified 25 MHz or 27 MHz reference frequency required by the programmed design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a cost-effective replacement for multiple discrete oscillators is required. The factory-programmed nature eliminates the need for onboard I2C configuration logic. Verify that the required output count does not exceed eight and that the frequency plan adheres to the simultaneous output constraints above 112.5 MHz.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5350 family of clock generators, which are designed to replace crystals and crystal oscillators in consumer electronics. The 'A' variant specifically supports only a crystal input reference, distinguishing it from variants that accept voltage-controlled or external clock inputs. The GMR suffix indicates tape and reel packaging suitable for automated surface-mount assembly.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other factory-programmed Si5350A parts with different output counts, such as the 10-MSOP (3 outputs) or 16-QFN (4 outputs) versions. Cross-family substitution with Si5351 requires verification of I2C configurability versus fixed pin-control operation.