The XC3S400A-4FTG256C is a high-performance field-programmable gate array (FPGA) from Xilinx. It is a member of the Spartan-3A family and offers a balance of cost and performance for a wide range of applications. With 400,000 system gates, 6160 logic cells, and 288 I/O pins, this FPGA is capable of handling complex digital designs. The XC3S400A-4FTG256C features an advanced 90nm process technology, enabling low power consumption and high-speed performance. It also includes built-in features such as digital clock managers, phase-locked loops, and block RAM for efficient implementation of designs. This FPGA is housed in a 256-pin fine-pitch ball grid array (FTGBA) package, making it suitable for compact and high-density PCB designs. With its comprehensive set of features, the XC3S400A-4FTG256C is well-suited for a wide range of applications, including telecommunications, automotive, industrial control, and consumer electronics.