9ZXL1950DKILFT

Overview

The 9ZXL1950DKILFT is a second-generation, enhanced-performance differential buffer derived from the DB1900ZL. It features 19 LP-HCSL outputs with an integrated 85Ω output impedance, eliminating the need for external termination resistors and reducing board area by approximately 130mm². The device operates on a single 3.3V supply (3.135V to 3.465V) and supports frequencies from 1 MHz to 400 MHz. It includes selectable PLL bandwidth control, spread spectrum compatibility for EMI reduction, and SMBus programmability for individual output enable/disable control.

Feature Summary

• 19 LP-HCSL outputs with fixed 85Ω output impedance, removing the requirement for 76 external series termination resistors
• Selectable PLL bandwidth and hardware/SMBus control of bypass mode without power cycling
• Spread spectrum clocking compatible; tracks input spreading for EMI reduction
• SMBus interface with 9 selectable addresses allowing multiple devices on the same segment

Applications

• PCI Express Gen 1 through Gen 5 compliant systems
• Intel QuickPath Interconnect (QPI) and Ultra Path Interconnect (UPI) applications
• Servers and high-performance computing platforms

Procurement Notes

Verify the suffix 'KILF' corresponds to the specific reel packaging configuration required for surface mount assembly. Confirm that the 72-VFQFPN package dimensions match the target PCB footprint. Ensure the operating temperature range of -40°C to +85°C meets system environmental requirements. Check current availability status as supply constraints may affect lead times.

Selection Notes

Select this component when a pin-compatible upgrade to the 9ZXL1950B is needed with improved phase jitter performance. Use this part for designs requiring fixed external feedback to maintain low drift in critical QPI/UPI links. Consider this buffer if minimizing board space by eliminating discrete termination resistors is a priority compared to standard HCSL buffers.

Part Context

This device belongs to the 9ZXL1950 family of zero-delay/fanout clock buffers. It serves as a derivative of the legacy DB1900Z, offering enhanced performance characteristics while maintaining backward compatibility in terms of pinout. The 'D' designation indicates the second-generation enhancement over previous iterations like the 'B' variant.

Replacement Considerations

The 9ZXL1950BKLFT is a pin-compatible predecessor. Verify that the improved phase jitter specifications of the 9ZXL1950D meet the design requirements before substituting older inventory.