As newer computing platforms add the number of USB ports available per system, any USB Host Controller port can easily be converted to a serial port using a single channel USB UART. For designs that may need to be bus or self-powered, the XR21V1410, a single channel 3.3V UART, can serve the need with a step down regulator from MaxLinear. The XR21B1411 is a 5V single channel USB UART that is also suited for bus powered applications.