The PI7C1401 is a I²C-bus/SPI Quad Port Expander, it’s specifically designed to manage common port types such as SFP+ and QSFP+. The PI7C1401 provides an I²C-bus/SPI interface, an interrupt output to host and four I²C interfaces, general purpose pins for low-speed control signals to the modules. The PI7C1401 can be used a wide range of applications such as Networking, Telecom, Storage/Data center, Embedded. The typical usage for this device is high volume applications requiring an "expander" to aggregate all low-speed control and I²C signals across four ports and presents a single I²C or SPI interface to host. Multiple PI7C1401s can be used in high-port-count applications with one I²C or SPI to host. The system BOM cost can be cut by using smaller IO count control device(FPGAs, CPLDs, MCUs) and by reducing routing layer congestion.