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Renesas Electronics 9ZXL1951D Clock Buffer

Renesas Electronics 9ZXL1951D Clock Buffer is a second-generation, enhanced-performance DB1900ZL derivative buffer. This clock buffer is a pin-compatible upgrade to the 9ZXL1951A, offering a much-improved phase jitter performance. The 9ZXL1951D buffer offers 8 OE# pins that can be configured via SMBus to control up to 16 of the devices' 19 outputs. This 9ZXL1951D buffer comes in a 6mm x 6mm QFN package for maximum space savings.  The 9ZXL1951D buffer includes fixed external feedback to maintain low drift for critical QPI/UPI applications. This 9ZXL1951D buffer is suitable for servers, storage, networking, and SSDs.

Features

  • LP-HCSL outputs with 85Ω Zout eliminate 76 termination resistors and save 130mm2 area
  • 8 OE# pins configurable to control up to 16 outputs for easy power management
  • 9 selectable SMBus addresses and multiple devices can share the same SMBus segment
  • Selectable PLL BW minimizes jitter peaking in cascaded PLL topologies
  • Hardware/SMBus control of PLL bandwidth and bypass changes mode without a power cycle
  • Spread spectrum compatible to track spreading input clock for EMI reduction
  • 100MHz PLL mode UPI support
  • Easy board routing with DIF input and DIF outputs on the outer row of pins
  • 6mm x 6mm dual-row 80-GQFN package
  • 19-output Z-buffer
  • PCIe clocking architectures supported
    • Common Clocked (CC)
    • Independent Reference (IR) with and without spread spectrum
  • Output 19 Low-Power (LP) HCSL output pairs with 85Ω Zout

Specifications

  • Less than 50ps cycle-to-cycle jitter
  • Less than 50ps output-to-output skew
  • Input-to-output delay fixed at 0ps
  • Less than 50ps input-to-output delay variation
  • Less than 0.5ps rms Phase jitter PCIe Gen4
  • Phase jitter QPI/UPI > = 9.6GB/s < 0.2ps rms
  • Less than 1.0ps rms phase jitter IF-UPI

Applications

  • Servers
  • Storage
  • Networking
  • SSDs

Block Diagram

Block Diagram - Renesas Electronics 9ZXL1951D Clock Buffer

Evaluation Board

Renesas Electronics EVK9ZXL1951D Evaluation Board

Evaluation kit for 19-Output DB1900Z for PCIe Gen1-4 and QPI/UPI.

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Pubblicato: 2018-07-04 | Aggiornato: 2023-01-25