MDB1900ZBQY

Overview

The MDB1900ZBQY is a zero delay buffer designed for PCIe, SAS, SATA, and QPI applications. It features a fully integrated programmable PLL with external feedback for true zero-delay operation. The device accepts one differential HCSL input and provides nineteen differential HCSL-compatible outputs. It supports 3.3V or 2.5V supply voltages and operates within a temperature range of -40°C to +85°C. Key electrical parameters include a maximum frequency of 133.33MHz in zero-delay mode, cycle-to-cycle jitter under 35ps, and output-to-output skew under 35ps.

Feature Summary

• True zero delay buffer mode with external feedback path for low drift
• Nineteen differential HCSL-compatible clock output pairs
• SMBus interface for software control of output enable/disable and delay tuning
• Spread spectrum modulation tolerant for EMI reduction

Applications

• PCI Express timing (Gen1/Gen2/Gen3) in Intel platforms
• SATA / SAS timing for storage systems
• Intel Quickpath Interconnect (QPI)
• ESI and SMI systems

Procurement Notes

Verify the ordering suffix 'QY' corresponds to the industrial temperature range (-40°C to +85°C). Confirm package details match the 72-pin 10mm x 10mm QFN specification. Ensure compatibility with 3.3V or 2.5V power supplies as required by the design.

Selection Notes

Select this component when a high fanout zero-delay buffer is needed for PCIe or QPI interfaces. The external feedback topology minimizes input-to-output delay variation. Consider the SMBus addressability if multiple devices share the same bus segment. Verify that the 19 differential outputs meet the system's clock distribution requirements.

Part Context

The MDB1900ZBQY is part of the MDB1900Z series, originally manufactured by Micrel, which was acquired by Microchip Technology. It is designed to be pin-compatible with Intel's DB1900Z specification. The 'QY' suffix denotes the extended temperature range variant compared to the commercial 'QZ' version.

Replacement Considerations

The MDB1900ZBQZ is the commercial temperature range equivalent. For enhanced performance upgrades, consider the 9ZXL1950D or 9ZXL1930D series, which offer improved phase jitter and software-controlled features while maintaining pin compatibility.