SI5351A-B07321-GT

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5351A-B07321-GT is a factory preprogrammed I2C programmable clock generator featuring three CMOS outputs in an MSOP-10 package. It utilizes a MultiSynth fractional divider architecture to generate non-integer-related frequencies from 2.5 kHz to 200 MHz with 0 ppm error. The device operates on a core supply voltage of 2.5 V or 3.3 V and accepts a 25 MHz or 27 MHz crystal reference. Key electrical parameters include a maximum output frequency of 200 MHz, typical period jitter of 70 ps, and an operating temperature range of -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates up to eight independent non-integer-related frequencies using high-resolution MultiSynth fractional dividers.
• Provides exact frequency synthesis at each output with zero parts per million (ppm) error.
• Supports configurable spread spectrum modulation selectable at each individual output.
• Features glitchless frequency changes and adjustable output delay capabilities.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing crystals, crystal oscillators, VCXOs, PLLs, and fanout buffers in cost-sensitive designs.
• Audio and video equipment synchronization.
• Networking and communication infrastructure.
• Servers and storage systems requiring multiple clock domains.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory programming code associated with the B07321 suffix against the required frequency plan before procurement. Confirm that the MSOP-10 package dimensions align with the target PCB land pattern. Ensure the I2C pull-up voltages are compatible with the selected VDDO level for reliable communication.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when a fixed-frequency configuration is preferred over runtime programmability. The Si5351A variant requires an external crystal and lacks the internal VCXO found in the Si5351B. Verify that the required output frequencies do not exceed the simultaneous unique frequency limits above 112.5 MHz. Check if the 3-output capacity meets system requirements compared to higher-density packages.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family of I2C-programmable clock generators. The 'A' designation indicates it relies solely on an external crystal reference without an integrated VCXO. The 'GT' suffix denotes the tube packaging format for the MSOP-10 variant. It serves as a direct replacement for discrete timing components in embedded systems.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5351A-B-GT: Blank configuration version of the same package.

Clock Generators, PLLs, Frequency Synthesizers FAQ

Does the SI5351A-B07321-GT include an internal VCXO?

No, the Si5351A variant does not contain an internal Voltage-Controlled Crystal Oscillator (VCXO). It requires an external AT-cut crystal for operation. The VCXO feature is available only in the Si5351B variant.

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

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

How is the output drive strength configured?

The output drive strength is programmable via I2C registers. The default setting provides a 50-ohm output impedance, but other levels can be selected to optimize rise/fall times and power consumption.