9ZXL1231AKLF/W

Overview

The Renesas 9ZXL1231AKLF/W is a second-generation zero-delay clock buffer from the 9ZXL1231 series. It functions as a differential buffer with one input and twelve outputs, designed for high-performance computing applications. The device supports Intel QPI and PCIe standards, operating at frequencies up to 150 MHz. It utilizes LP-HCSL output signaling to reduce power consumption and board space by eliminating external termination resistors. The component is housed in a 64-VFQFPN package and includes hardware control features for each output enable pin.

Feature Summary

• Zero-delay buffer architecture with 1:12 input-to-output ratio
• LP-HCSL differential outputs eliminate 24 external resistors
• Hardware control of individual output enables via OE# pins
• Supports spread spectrum input for EMI reduction

Applications

• Servers and high-performance computing systems
• PCI Express (PCIe) Gen 1–5 compliance circuits
• Intel QuickPath Interconnect (QPI) and Ultra Path Interconnect (UPI)
• NVMe storage controllers

Procurement Notes

Verify the suffix /W indicates specific packaging or environmental compliance details distinct from the standard reel variant. Confirm moisture sensitivity level and reflow soldering profile requirements prior to assembly. Check current availability status as supply chain conditions may vary. Ensure the ordering part number matches the exact electrical specifications required for the target design.

Selection Notes

Select this component when a low-jitter, zero-delay buffer is needed for PCIe or QPI interfaces requiring 12 differential outputs. Compare against the 9ZXL1231A for improved phase jitter performance and enhanced security features. Consider the 9ZXL1231EKILFT if higher frequency operation up to 400 MHz is required. Evaluate board space constraints given the 9mm x 9mm 64-VFQFPN footprint.

Part Context

This model belongs to the Renesas 9ZXL1231 family of second-generation zero-delay clock buffers. It serves as an enhanced successor to the 9ZXL1231A, offering better jitter performance and additional system security features. The family is optimized for critical processor interconnects where precise clock distribution and minimal skew are essential for system stability.

Replacement Considerations

The 9ZXL1231E is a pin-compatible upgrade offering improved phase jitter. For higher frequency needs, the 9ZXL1231EKILFT supports up to 400 MHz. The discontinued 9ZXL1230AKLFT is a similar 1:12 buffer but uses a 56-pin package.