9FGL0251CKILF

Overview

The Renesas 9FGL0251CKILF is a PCIe Gen 1–6 compliant clock generator designed for high-performance computing applications. It features two differential LP-HCSL outputs and one LVCMOS reference output, operating at a fixed 25MHz frequency with a 3.3V supply voltage. The device supports Common Clocked (CC), Separate Reference No Spread (SRNS), and Separate Reference Independent Spread (SRIS) architectures. Integrated terminations for 100Ω and 85Ω systems reduce external component requirements. Each output includes a dedicated OE# pin to support PCIe CLKREQ# functionality. The component is housed in a compact 4mm × 4mm 24-VFQFPN package.

Feature Summary

• PCIe Gen 1–6 CC-compliant with support for SRNS and SRIS clocking architectures
• Integrated terminations for 100Ω and 85Ω systems, eliminating four resistors per output
• Pin-selectable spread spectrum levels: SRNS 0%, CC 0%, and CC/SRIS -0.5%
• SMBus-selectable CC/SRIS -0.25% spread spectrum option

Applications

• Servers and High-Performance Computing systems
• NVMe Storage solutions
• Networking Accelerators
• Industrial Control equipment

Procurement Notes

Verify the specific ordering suffix carefully, as the CKILF variant may differ from the CKILFT tape-and-reel version regarding packaging and handling. Confirm current availability status, as this product line has been marked as obsolete or end-of-life by the manufacturer. Ensure compatibility with existing PCB footprints for the 24-VFQFPN package before procurement.

Selection Notes

Select this component when a fixed 25MHz PCIe clock source is required for Gen 1 through Gen 6 interfaces. The integrated termination resistors make it suitable for designs aiming to minimize bill of materials count. Verify that the system architecture aligns with the supported CC, SRNS, or SRIS modes. Consider the single-input crystal requirement versus multi-output distribution needs.

Part Context

The 9FGL0251 belongs to the VersaClock 6 family of clock generators. It shares architectural similarities with other models like the 9FGL0241 and 9FGL0441, differing primarily in output count and specific configuration options. This series targets low-jitter timing applications requiring compliance with evolving PCIe standards.

Replacement Considerations

Direct replacements include the 9FGL0241CKILF or 9FGL0251CKILFT depending on packaging preference. Cross-model substitution within the 9FGL02x1 series requires verification of pinout compatibility and electrical parameter alignment.