9ZXL1231EKILF/W

Overview

The Renesas 9ZXL1231EKILF/W is a second-generation DB1200ZL differential clock buffer designed for high-performance computing and PCIe applications. It features a 1:12 input-to-output ratio with Low Power HCSL (LP-HCSL) outputs, eliminating the need for external termination resistors. The device integrates a Phase-Locked Loop (PLL) supporting frequencies up to 400 MHz and operates within a supply voltage range of 3.135V to 3.465V. Packaged in a compact 64-VFQFPN (9x9 mm) format, it supports Intel QPI and UPI standards while offering hardware and SMBus control over output enablement and PLL bandwidth.

Feature Summary

• 12-Output LP-HCSL Buffer: Eliminates 24 external termination resistors, saving approximately 41mm² of board area.
• PCIe Gen 1–5 Compliance: Supports data rates required by modern PCI Express generations.
• Flexible Control: Features 12 independent Output Enable pins and 9 selectable SMBus addresses for multi-device configurations.
• Jitter Optimization: Selectable PLL bandwidth minimizes jitter peaking in cascaded PLL topologies.

Applications

• Servers and High-Performance Computing
• NVMe Storage Systems
• Networking Accelerators
• Industrial Control Systems

Procurement Notes

Verify the suffix '/W' against the official datasheet to confirm if it denotes a specific tape-and-reel packaging variant or environmental compliance level distinct from the standard 'AKILFT'. Confirm moisture sensitivity level (MSL 3) and reflow soldering profiles prior to assembly. Ensure the 3.3V supply tolerance matches the 3.135V–3.465V specification.

Selection Notes

Select this component when designing systems requiring low-power LVCMOS-compatible outputs without external termination. It serves as a pin-compatible upgrade to the 9ZXL1231A, offering improved phase jitter performance. Consider the 9ZXL1231EKILFT if a standard tray package is preferred over the potentially reel-packaged '/W' variant.

Part Context

This part belongs to the 9ZXL1231 series of zero-delay clock buffers. It is an enhanced version of the 9ZXL1231A, providing better jitter performance and security features. The fixed external feedback loop ensures low drift, which is critical for UPI and legacy QPI applications.

Replacement Considerations

The 9ZXL1231A is the previous generation counterpart. For direct replacement, verify that the 9ZXL1231AKILFT meets the specific frequency and jitter requirements, noting potential differences in MSL ratings and packaging formats.