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