The AD8159 is an asynchronous, protocol agnostic, quad-lane 2:1 switch with 12 differential PECL-/CML-compatible inputs and 12 differential CML outputs. The operation of this product is optimized for NRZ signaling with data rates of up to 3.2 Gbps per lane. Each lane offers two levels of input equalization and four levels of output pre-emphasis.
The AD8159 consists of four multiplexers and four demultiplexers, one per lane. Each port is a four-lane link, and each lane runs up to a 3.2 Gbps data rate, independent of the other lanes. The lanes are switched independently using the four select pins, SEL[3:0]; each select pin controls one lane of the port. The AD8159 has low latency and very low lane-to-lane skew.
The main application of the AD8159 is to support redundancy on both the backplane side and the line interface side of a serial link. The device has unicast and bicast capability; therefore, it can be configured to support either 1 + 1 or 1:1 redundancy.
The AD8159 supports reversing of the output and input pins on one of its ports, which helps to connect two ASICs with opposite pinouts.
The AD8159 is also used for testing high speed serial links by duplicating incoming data and sending it to the destination port and to the test equipment simultaneously.
**Applications**
Low cost redundancy switch
SONET OC-48/SDH-16 and lower data rates
XAUI (10 gigabit Ethernet) over backplane
Gigabit Ethernet over backplane
Fibre Channel 1.06 Gbps and 2.125 Gbps over backplane
InfiniBand® over backplane
PCI Express (PCIe) over backplane
### Features and Benefits
Port level 2:1 mux/1:2 demux
Each port consists of 4 lanes
Each lane runs from dc to 3.2 Gbps, independent of the other lanes
Compensates over 40 inches of FR4 at 3.2 Gbps through 2 levels of input equalization or 4 levels of output pre-emphasis
