9ZX21901CKLFT

19-Output Differential Zbuffer for PCIe Gen2/3 and QPI 9ZX21901C DATASHEET General 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. • 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 Recommended Application • 19-output PCIe Gen3/QPI buffer with fixed feedback for • Romley platforms Output Features • • • • 19 – 0.7V current mode differential HCSL output pairs Key Specifications • • • • • • 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 Cycle-to-cycle jitter: < 50ps Output-to-output skew: