SI5391C-A-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5391C-A-GM is a programmable clock generator featuring 12 outputs and a QFN-64 package. It supports integer-only frequency synthesis with output frequencies up to 1028 MHz. Input options include external crystals (25–54 MHz), differential clocks (up to 750 MHz), or LVCMOS clocks (up to 250 MHz). The device operates on core voltages of 1.8 V and 3.3 V, with independent output supplies at 3.3 V, 2.5 V, or 1.8 V. It delivers 75 fs RMS jitter in integer mode and functions within a temperature range of -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using integer-only synthesis
• Provides highly configurable outputs compatible with LVDS, LVPECL, LVCMOS, CML, and HCSL formats
• Supports zero delay mode for fixed and consistent minimum delay between selected inputs and outputs

Clock Generators, PLLs, Frequency Synthesizers Applications

• 100/200/400G switches
• Ethernet switches/routers
• Clock tree generation replacing XOs, buffers, and signal format translators
• Clocking for FPGAs, processors, and memory

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific grade suffix 'C' indicates integer-only synthesis capability, as other grades support fractional modes. Confirm that the factory pre-programmed configuration matches the target application requirements before deployment. Ensure the ordering part number includes the correct package and temperature range designators.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when integer-only frequency synthesis is sufficient for the system design. Verify that the required output frequencies fall within the 100 Hz to 1028 MHz range. Ensure the input source is compatible with the supported crystal or clock frequencies. Consider the Si5391A variant if fractional synthesis or lower jitter performance is required.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The SI5391C-A-GM belongs to the Si5391 family of ultra-low-jitter clock generators. It shares the same physical package and general architecture with grades A, B, D, and P. The primary distinction lies in the frequency synthesis mode, where the C grade is restricted to integer operations compared to the fractional capabilities of the A grade.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5391A-A-GM offers identical hardware but supports fractional synthesis. Si5391B-A-GM provides a reduced maximum output frequency range. Si5391D-A-GM also features integer-only synthesis with a limited frequency range.