Description
The 9ZML1232 is a 2-input/12-output differential mux for
use in servers. It meets the demanding DB1200ZL
performance specifications and utilizes Low-Power
HCSL-compatible outputs to reduce power consumption
and termination components. It is suitable for PCI-Express
Gen1–3 or QPI/UPI applications, and uses a fixed external
feedback to maintain low drift for demanding QPI
applications.
Applications
Clock Mux for Servers
Output Features
• 12 – Low-Power (LP) HCSL Output Pairs

Features
• 25MHz to 100MHz ZDB mode; supports PFT clock delay
management
• 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 PLLs
• 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 < 65ps
• Input-to-output delay: Fixed at 0ps
• Input-to-output delay variation < 50ps
• Phase jitter: PCIe Gen3 < 1ps rms
• Phase jitter: QPI/UPI 9.6GB/s < 0.2ps rms