9ZXL1251AKLF

Overview

The 9ZXL1251AKLF is a clock buffer and distribution IC from the Renesas 9ZXL family, designed for high-performance computing applications. It features a single input and twelve outputs with a 1:12 ratio. The device supports differential HCSL signaling on both input and output sides, operating at frequencies up to 400MHz. It requires a supply voltage between 3.135V and 3.465V and functions within an industrial temperature range of -40°C to 85°C. The component is housed in a 64-VFQFPN package measuring 9x9 mm.

Feature Summary

• 12-output differential HCSL clock distribution
• Supports Intel QPI and PCIe interfaces
• Maximum frequency of 400MHz
• Integrated PLL for jitter attenuation

Applications

• Intel QuickPath Interconnect (QPI) systems
• PCI Express (PCIe) infrastructure
• Server and high-performance computing platforms

Procurement Notes

Verify availability status as inventory levels fluctuate. Confirm the specific suffix 'AKLF' matches design requirements, noting that packaging may vary between tape-and-reel or cut tape depending on distributor stock. Check for recent Product Change Notifications regarding manufacturing site or material updates before finalizing procurement.

Selection Notes

Select this component when a single reference clock must be distributed to twelve downstream devices requiring differential HCSL inputs. Ensure the system power supply provides a stable voltage within the 3.135V to 3.465V range. Verify that the 64-VFQFPN footprint fits the PCB layout constraints and that the thermal dissipation capabilities of the board support the device's power consumption at maximum operating frequencies.

Part Context

This part belongs to the 9ZXL series of low-power, high-performance clock buffers. It serves as a critical timing element in complex digital systems, replacing older generation buffers with improved jitter performance and lower power consumption. The 9ZXL1251 variant specifically targets high-speed serial link applications requiring significant fan-out.

Replacement Considerations

Direct replacements include other members of the 9ZXL family with similar pinouts and electrical characteristics, such as the 9ZXL1251EKILFT. Verify compatibility by comparing output drive strength, supply voltage ranges, and package dimensions. Cross-reference with manufacturer substitution guides for any functional differences introduced by updated revisions.