MDB1900ZCQY-TR

Overview

The MDB1900ZCQY-TR is a zero delay buffer featuring an integrated programmable PLL, designed for distributing reference clocks in PCIe Gen1/Gen2/Gen3, SATA, SAS, ESI, and Intel QPI systems. It provides one differential HCSL input and nineteen differential HCSL-compatible outputs with a 1:19 ratio. The device operates on a 2.375V to 3.465V supply within the -40°C to +85°C temperature range. Key electrical specifications include cycle-to-cycle jitter under 35ps in PLL mode, output-to-output skew under 35ps, and fixed 0ps input-to-output delay variation of 13ps.

Feature Summary

• Integrated high-performance PLL supporting zero delay (0ps) buffer mode at 100MHz and 133.33MHz
• Nineteen differential HCSL-compatible clock output pairs with eight dedicated OE# pins for glitch-free control
• Internal feedback path eliminates external PCB routing for zero delay configuration
• SMBus interface allows software control of output properties and selectable addressing for multiple devices

Applications

• PCI Express timing for Intel Romley platforms
• SATA/SAS storage system timing
• Intel Quickpath Interconnect (QPI)
• ESI and SMI systems

Procurement Notes

Verify component authenticity through authorized Microchip Technology distributors or Micrel channels. Confirm the specific ordering suffix 'QY' corresponds to the industrial temperature grade (-40°C to +85°C). Ensure compliance with RoHS and PFOS standards as specified in the datasheet documentation.

Selection Notes

Select this component when designing for Intel DB1900Z specifications requiring internal feedback paths. Choose the QY suffix for industrial temperature applications. Ensure the design supports 3.3V or 2.5V power supplies and accommodates the 72-pin 10mm x 10mm QFN package footprint.

Part Context

This part belongs to the MDB1900Z series of zero delay buffers originally manufactured by Micrel, Inc., which was acquired by Microchip Technology. The MDB1900ZC variant specifically targets high-speed serial interconnects like PCIe and QPI, offering low phase noise and jitter filtering capabilities compared to standard fanout buffers.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.