9ZX21901BKLFT

DATASHEET 9ZX21901B 19-Output Differential Zbuffer for PCIe Gen2/3 and QPI Description Features/Benefits The 9ZX21901 is a version of the Intel DB1900Z Differential Buffer with an ajdustable external feedback path allowing the user to eliminate trace delays from their design. It is suitable for PCIe Gen3 or QPI applications. The part is backwards compatible to PCIe Gen1 and Gen2. The device maintains low drift for critical QPI applications. In bypass mode, the IDT9ZX21901 can provide outputs up to 400MHz. • • Recommended Application 19 output PCIe Gen3/QPI buffer with adjustable feedback for Romley platforms • • • • Output Features • • • • 19 - 0.7V current mode differential HCSL output pairs External feedback path; Adjustable input-to-output delay 9 Selectable SMBus addresses/ Multiple devices can share same SMBus segment 8 dedicated OE# pins/ hardware control of outputs PLL or bypass mode/ PLL can dejitter incoming clock Selectable PLL BW/ minimizes jitter peaking in downstream PLL's Spread spectrum compatible/tracks spreading input clock for EMI reduction SMBus Interface/ unused outputs can be disabled 100MHz & 133.33MHz PLL mode/ Legacy QPI support Undriven differential outputs in Power Down mode for maximum power savings Key Specifications • • • • • • Functional Block Diagram Cycle-to-cycle jitter: < 50ps Output-to-output skew: