ICS9ZX21901CKLFT Datasheet, PDF (1/16 Pages) Integrated Device Technology – 19-Output Differential Zbuffer for PCIe Gen2/3 and QPI

DATASHEET
19-Output Differential Zbuffer for PCIe Gen2/3 and QPI
9ZX21901C
Description
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
Output Features
• 19 - 0.7V current mode differential HCSL output pairs
Features/Benefits
• 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: <65ps
• Input-to-output delay: Fixed at 0 ps
• Input-to-output delay variation: <50ps
• Phase jitter: PCIe Gen3 < 1ps rms
• Phase jitter: QPI 9.6GB/s < 0.2ps rms
Functional Block Diagram
OE(5_12)# ⁸
DIF_IN
DIF_IN#
HIBW_BYPM_LOBW#
100M_133M#
CKPWRGD/PD#
SMB_A0_tri
SMB_A1_tri
SMBDAT
SMBCLK
Logic
Z-PLL
(SS Compatible)
Note: Even though the feedback is fixed, DFB_OUT still needs a
termination network for the part to function.
DFB_OUT
DIF(18:0)
IREF
IDT^® 19-Output Differential Zbuffer for PCIe Gen2/3 and QPI
1
1648H - 12/08/11