9ZXL1231AKLFT

Overview

The Renesas Electronics 9ZXL1231AKLFT is a second-generation zero-delay clock buffer designed for high-performance computing applications. It features a single HCSL differential input and twelve LP-HCSL differential outputs, operating at maximum frequencies up to 150 MHz. The device utilizes a 64-VFQFPN (9x9 mm) surface-mount package with a 0.5 mm pitch. It operates within a supply voltage range of 3.135 V to 3.465 V and supports an industrial temperature range from 0°C to +70°C. Key electrical characteristics include a maximum propagation delay of 4.5 ns and a typical operating current of 110 mA.

Feature Summary

• Twelve LP-HCSL differential outputs eliminate the need for external termination resistors, reducing board space and component count.
• Zero-delay architecture ensures minimal phase jitter by using fixed external feedback, suitable for critical QPI/UPI applications.
• Hardware and SMBus control allows individual output enable management and selectable PLL bandwidth settings.
• Spread spectrum compatible design tracks input clock spreading to assist in EMI reduction.

Applications

• Intel QuickPath Interconnect (QPI) and Ultra Path Interconnect (UPI) systems
• PCI Express (PCIe) Gen 1 through Gen 5 compliant platforms
• Servers and high-performance computing infrastructure
• NVMe storage controllers and networking accelerators

Procurement Notes

Verify the suffix 'T' indicates tape-and-reel packaging, which differs from the tray-packaged '9ZXL1231AKLF'. Confirm moisture sensitivity level (MSL 3) requirements for reflow soldering profiles. Ensure the specific revision matches the required thermal and electrical specifications for the target application environment.

Selection Notes

Select this model when twelve low-power differential outputs are required for PCIe or QPI bus distribution. Compare against the standard '9ZXL1231AKLF' if tray packaging is preferred over reel packaging. Consider the '9ZXL1231EKILFT' variant if extended commercial temperature ranges (-40°C to 85°C) are necessary for the system design.

Part Context

This component belongs to the Renesas 9ZXL1231 family of enhanced-performance zero-delay buffers. It serves as a pin-compatible upgrade to earlier generations, offering improved phase jitter performance and increased system security features while maintaining compatibility with existing board layouts.

Replacement Considerations

The discontinued 9ZXL1230AKLFT is listed as a similar replacement option. Verify pinout compatibility and electrical parameter alignment before substituting older variants in existing designs.