9FGL6251AQ202LTGI

Overview

The 9FGL6251AQ202LTGI is a clock generator and buffer from the Renesas 9FGL6251 series, designed for PCIe applications. It operates at a supply voltage of 3.3V with an internal reference voltage of 1.8V. The device features two differential LP-HCSL outputs with integrated 85Ω termination resistors, eliminating the need for external components. It supports Common Clock (CC) and Separate Reference Independent Spread Spectrum (SRIS) architectures, defaulting to -0.5% spread spectrum for the 202 configuration. The unit is housed in a 28-VQFP-N package measuring 4mm x 4mm.

Feature Summary

• Intelligent detection of input clock presence with automatic mode switching
• Two 100MHz LP-HCSL outputs with integrated 85Ω terminations
• SMBus-selectable -0.25% spread spectrum capability
• REF clock output functionality to save external crystal oscillators

Applications

• Single and dual-ported nVME SSDs
• PCIe master/slave clocking systems
• Clock multiplexing applications

Procurement Notes

Verify moisture sensitivity level (MSL) requirements prior to assembly, as the component is classified as moisture sensitive. Confirm the specific suffix LTGI corresponds to the tray packaging format containing 490 units per carrier. Ensure compatibility with the required 3.3V VDD and 1.8V VDDREF power rails during design-in.

Selection Notes

Select this part for designs requiring integrated 85Ω termination on LP-HCSL outputs to reduce bill of materials. The AQ202 variant is appropriate for SRIS or CC architectures requiring -0.5% spread spectrum by default. Compare against the 9FGL6241 if 100Ω output impedance is required instead of the 85Ω provided here.

Part Context

This component belongs to the 9FGL6251 family of intelligent PCIe clock buffers/generators. The 'A' indicates the inclusion of an integrated crystal option, while 'Q' specifies the 28-VQFP-N package. The '202' suffix denotes the specific electrical configuration supporting SRIS/CC architectures with -0.5% SSC defaults. The 'LTGI' suffix identifies the tape and reel or tray packaging and lead finish specifications.

Replacement Considerations

The 9FGL6251AQ302LTGI8 serves as a related variant within the same family, differing primarily in packaging (Reel vs Tray) and potentially SSC configuration defaults. Verify pinout and electrical parameter equivalence before substitution.