9DBU0631AKLF

Overview

The Renesas 9DBU0631AKLF is a PCI Express zero-delay fanout buffer IC designed for clock distribution. It accepts an HCSL differential input and provides six LP-HCSL differential outputs with a 1:6 ratio. The device operates at a maximum frequency of 167 MHz within a supply voltage range of 1.425 V to 1.575 V. Packaged in a 40-VFQFPN (5x5 mm) surface-mount format, it supports industrial temperature ranges from -40°C to 85°C. This component integrates PLL functionality to attenuate jitter while maintaining low power consumption suitable for high-speed digital systems.

Feature Summary

• Provides one differential HCSL input driving six differential LP-HCSL outputs
• Supports maximum operating frequencies up to 167 MHz
• Operates on a single 1.5 V supply rail (1.425 V to 1.575 V)
• Integrated PLL for jitter attenuation in zero-delay buffer mode

Applications

• PCI Express clock distribution networks
• High-performance computing system timing
• Server and storage controller clocking

Procurement Notes

Verify the suffix 'LF' indicates lead-free compliance and standard tape-and-reel packaging. Confirm the specific temperature grade matches the application requirements, as commercial variants may differ from the industrial -40°C to 85°C rating found in related datasheets. Ensure the ordering part number aligns with the required package quantity and moisture sensitivity level specifications.

Selection Notes

Select this component when a single source clock must drive multiple PCIe endpoints requiring LP-HCSL signaling. The 1:6 output ratio fits designs needing moderate fan-out without excessive board space. Verify that the input clock source meets HCSL voltage levels and that the system power budget accommodates the typical current draw associated with six active outputs at 167 MHz.

Part Context

This part belongs to the 9DBU0631 family of ultra-low-power PCIe buffers. It shares architectural similarities with other members like the 9DBU0231 but offers higher output density. The device replaces older discrete buffering solutions by integrating PLL and termination functions into a compact 40-pin QFN package.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the 9DBU0631AKILFT, which differs primarily in packaging configuration. Cross-family replacements require verification of output count and voltage compatibility.