9ZX21501C Datasheet, PDF (1/19 Pages) Integrated Device Technology – Fixed feedback path

DATASHEET
FIFTEEN OUTPUT DIFFERENTIAL ZBUFFER FOR PCIE GEN2/3 AND QPI
9ZX21501C
Description
The 9ZX21501C is a 15-output version of the 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
9ZX21501C can provide outputs up to 400MHz.
Recommended Application
15-output PCIe Gen3/QPI buffer with fixed feedback for
Romley platforms
Output Features
• 15 - 0.7V current mode differential HCSL output pairs
Functional Block Diagram
Features/Benefits
• Fixed feedback path; 0ps input-to-output delay
• 9 Selectable SMBus addresses; multiple devices can
share same SMBus segment
• 7 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
OE(5_8,10_12)#
7
DIF_IN
DIF_IN#
HIBW_BYPM_LOBW#
100M_133M#
CKPWRGD/PD#
SMB_A0_tri
SMB_A1_tri
SMBDAT
SMBCLK
Logic
Z-PLL
(SS Compatible)
DFB_OUT
DIF(14:0)
IREF
IDT® FIFTEEN OUTPUT DIFFERENTIAL ZBUFFER FOR PCIE GEN2/3 AND QPI
1
9ZX21501C
REV F 041613