9ZX21901C

DATASHEET 19-Output Differential Zbuffer for PCIe Gen2/3 and QPI Description Features/Benefits The 9ZX21901 is Intel DB1900Z Differential Buffer suitable for PCI- • Express Gen3 or QPI applications. The part is backwards compatible • to PCIe Gen1 and Gen2. A fixed external feedback maintains low drift for critical QPI applications. In bypass mode, the 9ZX21901 • can provide outputs up to 400MHz. • Recommended Application • 19 output PCIe Gen3/QPI buffer with fixed feedback for Romley platforms • 9 ZX21901C Output Features • 19 - 0.7V current mode differential HCSL output pairs • • • Fixed feedback path/ 0ps 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 • • • • • • Cycle-to-cycle jitter: < 50ps Output-to-output skew: