9ZXL1951ANHG8

Overview

The 9ZXL1951ANHG8 is a high-performance zero-delay buffer (ZDB) from the Renesas 9ZXL1951 series. It functions as a differential clock buffer designed for critical timing applications requiring low drift and precise synchronization. The device accepts HCSL input signals and provides multiple LP-HCSL outputs, eliminating the need for external termination resistors to save board space. It supports PCIe Gen 1–5 compliance and features software-controlled outputs via SMBus. The component is housed in an 80-lead GQFN package, suitable for surface-mount installation in high-density designs.

Feature Summary

• High-performance zero-delay buffer architecture with fixed external feedback for low drift
• 19 LP-HCSL differential outputs with integrated 85Ω termination, eliminating external resistors
• SMBus control for individual output enable/disable and selectable PLL bandwidth
• Supports spread spectrum input tracking for EMI reduction
• Housed in a compact 80-lead GQFN package

Applications

• PCI Express Gen 1–5 compliant systems
• Critical QPI/UPI memory interface applications
• High-performance computing servers
• Networking accelerators

Procurement Notes

Verify the specific ordering suffix ANHG8 against official Renesas documentation to confirm package type and moisture sensitivity level. Ensure compatibility with existing PCB footprints for the GQFN-80 package. Check for RoHS compliance status through official datasheets before procurement.

Selection Notes

Select this component when a high-output count zero-delay buffer is required for PCIe or processor clocking. The 9ZXL1951 series offers improved phase jitter performance compared to previous generations. Verify that the system design can accommodate the 80-lead GQFN footprint and that SMBus addressing does not conflict with other devices on the bus.

Part Context

The 9ZXL1951A is part of the second-generation enhanced-performance DB1900Z derivative family. It serves as a pin-compatible upgrade to earlier models like the 9ZXL1950B, providing significantly improved phase jitter performance while maintaining compatibility with established system architectures.

Replacement Considerations

The 9ZXL1951A is a direct pin-compatible upgrade for the 9ZXL1950B. Designers replacing older buffers should verify that the improved jitter specifications are compatible with downstream receiver requirements.