9FGU0431AKLFT

Overview

The 9FGU0431AKLFT is a clock generator and multiplexer IC from Renesas Electronics, designed for PCI Express (PCIe) applications. It operates with a maximum frequency of 137.5 MHz and features one circuit with a 1:4 input-to-output ratio. The device accepts HCSL differential inputs and provides HCSL differential outputs. It functions within a supply voltage range of 1.7 V to 1.9 V and supports an operating temperature range of -40°C to 85°C. The component is housed in a 32-VFQFN package with exposed pads, measuring 5x5 mm.

Feature Summary

• Supports PCIe Gen 1/2/3 clocking architectures
• Integrates PLL for low-jitter performance
• HCSL differential input/output signaling
• Glitch-free switching capability

Applications

• PCI Express (PCIe) root complex clocks
• PCI Express switch clocks
• Server and workstation motherboard timing

Procurement Notes

Verify the specific suffix 'AKILFT' against the manufacturer's current datasheet to confirm pinout compatibility and RoHS status. Check for Product Change Notifications (PCNs) regarding package revisions or material changes. Ensure the ordering quantity matches the standard tape-and-reel packaging specifications provided by Renesas.

Selection Notes

Select this component when a single-ended or differential HCSL source drives multiple PCIe endpoints requiring a 1:4 fan-out. Confirm that the system power budget aligns with the 1.7V–1.9V supply requirement. Evaluate the 32-QFN package dimensions against the PCB footprint constraints. Verify that the 137.5 MHz maximum frequency meets the target PCIe generation speed requirements.

Part Context

This part belongs to the 9FGU series of PCIe clock generators and muxes. It serves as a critical timing element in high-speed serial interface designs. The device replaces older discrete buffer solutions by integrating multiplexing and buffering functions into a single compact package, reducing board space and component count.

Replacement Considerations

Consult Renesas documentation for direct pin-compatible replacements or updated generations within the 9FGU family. Verify electrical parameter equivalence if substituting with similar PCIe clock mux devices from other manufacturers.