SI5351A-B-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5351A-B-GM is an I2C-programmable CMOS clock generator housed in a 20-QFN package. It provides eight independent LVCMOS outputs capable of generating non-integer-related frequencies from 2.5 kHz to 200 MHz with 0 ppm error. The device operates on a core supply voltage (VDD) ranging from 2.25 V to 3.6 V and supports output buffer voltages (VDDO) of 1.8 V, 2.5 V, or 3.3 V. It utilizes a standard 25 MHz or 27 MHz crystal reference and features low period jitter typically less than 70 ps peak-to-peak.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates up to eight free-running clocks using an internal oscillator for crystal replacement
• Provides exact frequency synthesis at each output with zero ppm error
• Features highly linear VCXO architecture for reliable operation over wide tuning ranges
• Supports configurable spread spectrum and glitchless frequency changes

Clock Generators, PLLs, Frequency Synthesizers Applications

• Audio/video equipment and gaming systems
• Printers, scanners, and projectors
• Handheld instrumentation and laser range finders
• Residential gateways and networking communication devices
• Servers and storage systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and factory programming status. Ensure that the required I2C pull-up voltages align with the supported range of 2.25 V to 3.63 V. Confirm that the application design accounts for the recommended operating temperature range of -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when replacing multiple crystals, oscillators, or PLLs with a single programmable source. The Si5351A variant is appropriate for designs requiring only free-running asynchronous clocks without external reference synchronization. Verify that the target system requires up to eight independent output frequencies within the specified voltage and load capacitance constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5351 family of I2C-programmable clock generators. The 'A' designation indicates a version that generates free-running clocks using an internal oscillator. The '-B' suffix denotes the specific silicon revision or feature set compatible with the datasheet Rev 1.3. The '-GM' suffix identifies the 20-QFN package option providing eight outputs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5351A-B-GM1R

Clock Generators, PLLs, Frequency Synthesizers FAQ

Can the Si5351A generate synchronous clocks?

No, the Si5351A generates free-running clocks using an internal oscillator. Synchronous clock generation requires an external reference clock input, which is a feature of the Si5351C variant.

What is the maximum number of unique frequencies above 112.5 MHz that can be output simultaneously?

Only two unique frequencies above 112.5 MHz can be simultaneously output. Multiple copies of the same high-frequency signal can be distributed across different pins.

Does the Si5351A include an integrated VCXO?

No, the Si5351A does not include an integrated VCXO. The VCXO feature is available only in the Si5351B variant.