SI5391A-A12892-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5391A-A12892-GM is a factory pre-programmed ultra low-jitter clock generator featuring 12 outputs. It supports integer and fractional synthesis with output frequencies up to 1028 MHz. The device accepts differential input clocks from 10 to 750 MHz or external crystals between 25 and 54 MHz. It delivers sub-100 fs RMS phase jitter, specifically 75 fs in integer mode and 115 fs in fractional mode. Operating on 1.8 V and 3.3 V supplies within a -40°C to +85°C range, it utilizes a 64-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using MultiSynth technology
• Delivers ultra-low phase jitter performance optimized for high-speed serial applications
• Supports highly configurable output formats including LVDS, LVPECL, LVCMOS, CML, and HCSL

Clock Generators, PLLs, Frequency Synthesizers Applications

• 100/200/400G switches
• 56G/112G PAM4 SerDes reference clocks
• Clock tree generation replacing XOs, buffers, and signal format translators
• Clocking for FPGAs, processors, and memory
• Ethernet switches/routers and OTN framers/mappers/processors

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific configuration encoded in the 'A12892' suffix against project requirements before procurement. As a factory pre-programmed component, the internal settings are fixed and cannot be modified via I2C or SPI after manufacturing. Confirm that the pre-set input/output frequencies match the system design specifications exactly.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when a fixed, non-reprogrammable clock solution is required to simplify board layout and reduce software overhead. Ensure the pre-programmed frequencies align with the target application's needs. For designs requiring field reconfigurability, consider standard Si5391 variants instead. Verify compatibility with available input sources such as crystals or differential clocks.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5391 family of ultra low-jitter clock generators. The 'A' designation indicates Grade A support for integer and fractional synthesis modes up to 1028 MHz. The 'GM' suffix specifies the 64-QFN package and industrial temperature range. Custom ordering part numbers are assigned by Skyworks based on configurations generated through ClockBuilder Pro software.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other Si5391A custom part numbers (e.g., Si5391A-Axxxxx-GM) with matching pre-programmed configurations. Standard Si5391A-A-GM devices can serve as functional equivalents if field programmability is acceptable.