This High-speed full-duplex 8 level conversion module use the chip TXS0108E. and it provides two-way communications capability. Usually apply on 5V MCU and 3.3V modules, 3.3V MCU and 5V modules, and other communications Compatible with MCU ,as well as communication of SD card level translation. SCM and iic, spi serial device level converter. OE active high enable IO ,and recommend low voltage terminal connected to the IO port.