9ZX21201 Datasheet, PDF (1/16 Pages) Integrated Device Technology – 12-OUTPUT DIFFERENTIAL Z-BUFFER FOR PCIE GEN2/3 AND QPI

DATASHEET
12-OUTPUT DIFFERENTIAL Z-BUFFER FOR PCIE GEN2/3 AND QPI 9ZX21201
General Description
The IDT9ZX21201 is a 12-output DB1200Z 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 IDT9ZX21201 can
provide outputs up to 150MHz.
Recommended Application
12-output PCIe Gen3/ QPI differential buffer for Romley and newer
platforms
Key Specifications
• Cycle-to-cycle jitter <50ps
• Output-to-output skew < 65 ps
• Input-to-output delay variation <50ps
• PCIe Gen3 phase jitter < 1.0ps RMS
• QPI 9.6GT/s 12UI phase jitter < 0.2ps RMS
Features/Benefits
• Space-saving 64-pin packages
• Fixed feedback path/ 0ps input-to-output delay
• 9 Selectable SMBus Addresses/Mulitple devices can share
the same SMBus Segment
• 12 OE# pins/Hardware control of each output
• PLL or bypass mode/PLL can dejitter incoming clock
• 100MHz or 133MHz PLL mode operation/supports PCIe
and QPI applications
• Selectable PLL bandwidth/minimizes jitter peaking in
downstream PLL's
• Spread Spectrum Compatible/tracks spreading input clock
for low EMI
• Software control of PLL Bandwidth and Bypass Settings/
PLL can dejitter incoming clock (B Rev only)
Output Features
• 12 - 0.7V differential HCSL output pairs
Functional Block Diagram
OE(11:0)#
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(11:0)
Note: Even though the feedback is fixed, DFB_OUT still needs a
termination network for the part to function.
IDT^® 12-Output Differential Z-buffer for PCIe Gen2/3 and QPI
1
IREF
1682B - 12/08/11