9ZX21901CKLF

Overview

The Renesas Electronics 9ZX21901CKLF is a clock buffer designed for Intel QPI and PCI Express (PCIe) applications. It features one differential input and nineteen HCSL outputs, providing a 1:19 fanout ratio. The device operates with a maximum frequency of 400 MHz and includes an integrated PLL. It functions within a supply voltage range of 3.135 V to 3.465 V and supports surface mount installation in a 72-VFQFPN package measuring 10x10 mm. The component is rated for operation between 0°C and +70°C.

Feature Summary

• 19 HCSL differential outputs for PCIe and QPI clock distribution
• Integrated PLL for jitter reduction or bypass mode support
• Maximum operating frequency of 400 MHz
• 72-VFQFPN (10x10 mm) exposed pad package

Applications

• Intel QPI clock buffering
• PCI Express (PCIe) clock distribution
• Server platform clock generation

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging variations such as tray versus tape-and-reel configurations. Ensure compatibility with moisture sensitivity level requirements during storage and handling. Confirm that the 72-VFQFPN footprint matches the target PCB design constraints.

Selection Notes

Select this component when a single differential clock source requires expansion into nineteen HCSL signals for high-speed interfaces. The integrated PLL allows for jitter cleaning if required by the system architecture. Verify that the 3.3V nominal supply voltage aligns with the specified 3.135V to 3.465V operational range.

Part Context

This part belongs to the 9ZX series of clock buffers manufactured by Renesas Electronics. It serves as a specialized timing solution for processor interconnects and peripheral buses requiring low-jitter clock distribution. The device replaces older generations of discrete buffer solutions in modern server designs.

Replacement Considerations

Check for pin-compatible upgrades within the 9ZX family, such as variants with different temperature ranges or packaging options. Verify electrical parameter equivalence for frequency and output drive strength before substitution.