UART Mux Click Mikroe UART Mux Click switches the UART pins (RX and TX) from the mikroBUS™ to one of the four available outputs. The Mikroe UART Mux click uses TI's SN74LV4052A Dual 4-Channel Multiplexer and Demultiplexer. This is designed for 2V to 5.5V VCC operation. Some typical applications for the SN74LV4052A include signal gating, chopping, modulation or demodulation (modem), and signal multiplexing.