9FGL6251AP301NDGI8

Overview

The 9FGL6251AP301NDGI8 is a clock generator and buffer from the Renesas 9FGL6251 series, designed for intelligent PCIe clock applications. It supports Common (CC) and Independent Reference (IR) architectures, featuring two differential LP-HCSL outputs with integrated 85Ω terminations. The device automatically detects input clocks and switches modes, offering SMBus-selectable spread spectrum clocking (-0.25% or -0.5%). It operates on 2.5V or 3.3V supplies, accepts 25MHz or 33.33MHz reference inputs, and is housed in a 4mm x 4mm 28-VQFP-N package.

Feature Summary

• Automatically detects input clock presence and switches clock modes
• Two 100MHz Low-power HCSL outputs with integrated 85Ω termination resistors
• SMBus-selectable Spread Spectrum Clocking options: -0.25% or -0.5%
• Supports Common (CC) and Independent Reference (IR) PCIe architectures

Applications

• Single and dual-ported nVME SSDs
• PCIe master/slave clocking systems
• Clock multiplexing applications
• U.2 and M.2 form factor storage devices

Procurement Notes

Verify the specific suffix NDGI8 against official Renesas documentation to confirm reel packaging and lead-free status. Confirm that the AP301 variant matches the required spread spectrum configuration (-0.5%) for the target design. Ensure compatibility with the 28-VQFP-N package footprint during PCB layout.

Selection Notes

Select this component when an intelligent buffer with automatic mode switching is required for NVMe or PCIe interfaces. The integrated output terminations reduce external BOM count. Verify that the 85Ω output impedance aligns with the downstream logic requirements, as other variants may offer 100Ω options.

Part Context

This part belongs to the 9FGL6251 family of intelligent PCIe clock buffers/generators. The 'AP301' designation typically indicates a specific spread spectrum configuration (-0.5%) compared to other variants like AP201 or AP202 which may default to different SSC settings or zero SSC.

Replacement Considerations

Direct replacements within the same family include 9FGL6251AP201, 9FGL6251AP202, and 9FGL6251AQ301. Verify that the alternative part's spread spectrum default and pinout compatibility match the current design constraints.