9FGL6251AQ302LTGI8

Application Specific Clock/Timing Overview

The 9FGL6251AQ302LTGI8 is a clock generator and buffer from the Renesas 9FGL6251 series, designed for PCIe Gen 1–6 applications. It supports Common Clock (CC) and Separate Reference Independent Spread (SRIS) architectures. The device features two differential LP-HCSL outputs with 85Ω output impedance and integrated terminations. It operates at 2.5V or 3.3V supply voltage, with a reference input frequency of 25MHz or 33.33MHz. The component is housed in a 4mm × 4mm 28-VQFP-N package.

Application Specific Clock/Timing Feature Summary

• Supports PCIe CC and SRIS clocking architectures with SMBus-selectable -0.25% spread spectrum.
• Two 100MHz Low-power HCSL (LP-HCSL) outputs with 85Ω impedance and integrated DIF terminations.
• Integrated crystal option available (Q suffix) and REF clock output capability.
• Automatically detects input clock presence and switches modes; includes one open-drain CC_IR output.

Application Specific Clock/Timing Applications

• Single and dual-ported nVME SSDs
• PCIe master/slave clock multiplexing
• U.2 and M.2 form factor systems

Application Specific Clock/Timing Procurement Notes

Verify the specific suffix LTGI8 against the official datasheet to confirm package type and moisture sensitivity level. Confirm RoHS compliance status through manufacturer documentation. Ensure ordering quantities align with factory reel specifications. Validate that the Q suffix requirement for integrated crystals matches the design needs.

Application Specific Clock/Timing Selection Notes

Select this model for designs requiring 85Ω output impedance and integrated terminations to reduce external resistor count. Choose between 25MHz or 33.33MHz reference inputs based on system requirements. Verify if the integrated crystal option (Q suffix) is necessary to save board space compared to external XO configurations.

Application Specific Clock/Timing Part Context

This part belongs to the 9FGL6251 family, which serves as the root part for 31/41/51 variants. The series is optimized for intelligent buffering and generation in high-speed serial interfaces like NVMe. The AQ302 designation indicates specific configuration parameters within the family.

Application Specific Clock/Timing Replacement Considerations

Check for pin-compatible alternatives within the 9FGL6251 series such as 9FGL6251AP202NDGI8. Verify if different impedance options (e.g., 100Ω models like 9FGL6241) are suitable for the target application architecture.