9DBV0731AKLFT

Overview

The 9DBV0731AKLFT is a seven-output, 1.8V PCIe fanout clock buffer manufactured by Renesas Electronics. Designed for PCI Express Gen 1 through 5 compliance, it features HCSL-compatible differential inputs and LP-HCSL differential outputs. The device supports frequencies from 1MHz to 200MHz and includes integrated 100Ω terminations for direct connection to transmission lines. It offers seven output enable pins for power management and three selectable SMBus addresses for configuration optimization.

Feature Summary

• Seven differential outputs with integrated 100Ω termination resistors
• HCSL input to LP-HCSL output signaling conversion
• Supports PCIe Gen 1–5 Common Clocked (CC) architecture
• Spread spectrum compatible for EMI reduction
• SMBus-selectable features including slew rate and amplitude tuning

Applications

• PCI Express (PCIe) Gen 1–5 system clock distribution
• High-performance computing server backplanes
• Storage area network (SAN) infrastructure
• Telecommunications base stations requiring low jitter clocking

Procurement Notes

Verify the suffix 'AKLFT' corresponds to the specific tape-and-reel packaging and lead-free composition required for the design. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the 32-pin VFQFPN package dimensions fit the PCB footprint constraints. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a single HCSL source must drive up to seven PCIe loads with minimal board space. The integrated 100Ω terminations eliminate external resistors, saving approximately 46mm² compared to standard solutions. Choose this part over multiplexers if glitch-free switching between multiple sources is not required. Verify that the 250fs typical additive phase jitter meets the system's timing budget.

Part Context

This device belongs to the 9DBV05x1-07x1-09x1 family of 1.8V PCIe fanout buffers. It shares architectural similarities with the 9DBV0541 (5-output) and 9DBV0941 (9-output) variants, differing primarily in output count and pin configuration. All members support SMBus control and spread spectrum input tolerance.

Replacement Considerations

The 9DBV0541 serves as a lower-output alternative if fewer than seven drives are needed. The 9DBV0941 provides additional outputs for larger systems. For 3.3V applications, the 9DML04 series may be considered, though it functions as a multiplexer rather than a pure fanout buffer.