9FGL0251CKILFT

Overview

The Renesas 9FGL0251CKILFT is a PCI Express (PCIe) clock generator IC designed for high-speed digital interfaces. It features a single PLL circuit that accepts a clock input and provides one differential output at a fixed frequency of 25MHz. The device operates within a supply voltage range of 3.135V to 3.465V and supports an ambient operating temperature from -40°C to 85°C. It is housed in a 24-VFQFPN package with dimensions of 4x4 mm, featuring an exposed pad for thermal dissipation. This component is specifically engineered to meet the timing requirements of PCIe architectures.

Feature Summary

• Fixed 25MHz output frequency optimized for PCIe reference clocking
• Single PLL-based clock generation with differential output signaling
• Compact 24-VFQFPN (4x4 mm) surface-mount package with exposed pad
• Operates on 3.3V nominal supply (3.135V–3.465V range)

Applications

• PCI Express (PCIe) motherboard clock distribution
• Add-in card reference clock generation
• High-speed interface timing synchronization

Procurement Notes

This component is officially listed as discontinued by the manufacturer. Verification of current availability requires checking distributor inventory status directly. No new production units are expected. Designers should initiate replacement strategies immediately if this part is required for new hardware development.

Selection Notes

Select this part only for legacy designs requiring a fixed 25MHz differential PCIe clock. Ensure the system board layout accommodates the 24-VFQFPN footprint. Verify that the power supply rail strictly maintains the 3.135V to 3.465V range to guarantee signal integrity and compliance with PCIe specifications.

Part Context

The 9FGL0251 series belongs to Renesas' PhiClock family of clock generators. The CKILFT suffix indicates specific packaging and tape-and-reel configuration details. This model serves as a dedicated reference clock source for PCIe Gen 1 through Gen 3 compliant systems, providing low-jitter performance necessary for reliable data transmission.

Replacement Considerations

As the part is discontinued, verify compatible substitutes such as the 9FGV1001C series or other Renesas PCIe clock generators with matching 25MHz output and VFQFPN-24 packages. Confirm pinout compatibility and electrical parameters before substitution.