9ZXL1251AKILFT

Overview

The 9ZXL1251AKILFT is a clock buffer integrated circuit manufactured by Renesas Electronics Corporation, belonging to the 9ZXL series. It functions as a zero-delay buffer and fan-out buffer designed for specific timing applications, including Intel QPI and PCI Express (PCIe). The device features one input and twelve outputs with a 1:12 ratio. It supports differential inputs and outputs, operating at a maximum frequency of 400MHz. The IC utilizes HCSL output signaling and includes an internal PLL. It operates within a supply voltage range of 3.135V to 3.465V and is rated for an ambient temperature range of -40°C to 85°C. The component is housed in a 64-VFQFPN package measuring 9x9 mm.

Feature Summary

• 12-Output Low Power HCSL Buffer
• Supports Intel QPI and PCIe Applications
• Differential Input/Output with Internal PLL
• Maximum Frequency of 400MHz

Applications

• Intel QuickPath Interconnect (QPI) Timing
• PCI Express (PCIe) Clock Distribution
• High-Speed Processor Clocking

Procurement Notes

Verify the exact suffix 'AKILFT' against official Renesas documentation, as distributor listings frequently reference the similar 'EKILFT' variant. Confirm current production status, as some sources indicate discontinuation or limited availability for specific suffixes. Ensure compatibility with the required 64-VFQFPN package and moisture sensitivity level (MSL 3) during storage and assembly.

Selection Notes

Select this component when a single differential clock source needs to drive up to twelve low-power HCSL loads. Verify that the system requires the specific 400MHz maximum frequency and the 3.135V–3.465V supply voltage range. Compare pinout and electrical characteristics with other 9ZXL variants like the 9ZXL1231EKILFT if alternative output configurations are acceptable.

Part Context

This part belongs to the Renesas 9ZXL family of high-performance clock buffers. These devices are engineered for demanding server and networking applications requiring precise clock distribution. The 9ZXL1251 specifically addresses the need for high-fan-out buffering in architectures utilizing Intel QPI and PCIe standards, ensuring signal integrity across multiple endpoints.

Replacement Considerations

Public data indicates the 9ZXL1251EKILFT as a closely related variant within the same family. Verify if the 'E' versus 'A' suffix denotes a packaging or qualification difference rather than a functional change. Cross-reference with the 9ZXL1231EKILFT if a different output count or package type is permissible.