9ZX21901DKLF

Overview

The Renesas 9ZX21901DKLF is a second-generation differential buffer designed for Intel Purley and newer platforms. It serves as an enhanced, pin-compatible upgrade to the 9ZX21901C with improved phase jitter performance. The device features one HCSL input and 19 LP-HCSL outputs, supporting frequencies up to 400 MHz in bypass mode. It utilizes a fixed external feedback path to maintain low drift for critical QPI/UPI applications. The component operates within a supply voltage range of 3.135 V to 3.465 V and is housed in a 72-VFQFPN package.

Feature Summary

• Enhanced DB1900Z compliant 19-output buffer with improved phase jitter performance
• Fixed external feedback path maintains low drift for QPI/UPI applications
• Supports PLL or bypass modes; PLL can de-jitter incoming clock signals
• Features 9 selectable SMBus addresses and 8 dedicated OE# pins

Applications

• Intel Purley platform clock distribution
• PCI Express (PCIe) Gen 4 clock buffering
• Ultra Path Interconnect (UPI) clock generation
• Quad Peripheral Interface (QPI) clocking

Procurement Notes

Verify the specific ordering suffix 'KLF' against official Renesas documentation to confirm lead-free status and tray packaging details. Ensure compatibility with moisture sensitivity level requirements during storage and assembly processes. Confirm that the 72-VFQFPN package dimensions align with the target PCB footprint design specifications.

Selection Notes

Select this component when upgrading from the 9ZX21901C to achieve lower phase jitter for PCIe Gen 4 or UPI 9.6GT/s applications. Choose the bypass mode if spread spectrum compatibility is required without PLL processing. Ensure the design supports the necessary fixed external feedback configuration to utilize the low-drift capabilities effectively.

Part Context

This part belongs to the 9ZX21901 series of differential buffers. It is functionally related to the 9ZX21901D but distinguished by the 'KLF' suffix indicating specific manufacturing and packaging attributes. It is distinct from the 9ZXL1950D, which offers LP-HCSL outputs and different power characteristics.

Replacement Considerations

The 9ZX21901C is a backward compatible predecessor. Verify electrical parameters and package alignment before substituting.