General Description
The 9ZML1231-IB0 is a 2-input/12-output differential mux
for use in servers. It meets the demanding DB1900Z
performance specifications and utilizes Low-Power
HCSL-compatible outputs to reduce power consumption
and termination components. It is suitable for PCI-Express
Gen1/2/3 or QPI/UPI applications, and uses a fixed external
feedback to maintain low drift for demanding QPI/UPI
applications.
Recommended Application
Clock Mux for Romley, Grantley and Purley Servers
Output Features
• 12 - Low-Power (LP) HCSL Output Pairs

Features/Benefits
• Fixed feedback path; 0ps input-to-output delay
• 9 Selectable SMBus addresses; multiple devices can
share same SMBus segment
• Separate VDDIO for outputs; allows maximum power
savings
• PLL or bypass mode; PLL can dejitter incoming clock
• Hardware or Software-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
• Differential outputs are Low/Low in power down;
maximum power savings
Key Specifications
• Cycle-to-cycle jitter <50ps
• Output-to-output skew <65 ps
• Input-to-output delay: Fixed at 0 ps
• Input-to-output delay variation <50ps
• Phase jitter: PCIe Gen3 <1ps rms
• Phase jitter: QPI/UPI 9.6GB/s <0.2ps rms