Texas Instruments SN74LXCH1T45 Single-Bit Dual-Supply Transceiver is a non-inverting bi-directional voltage level translation device with bus-hold circuitry. The I/O pin A and control pin (DIR) are referenced to VCCA logic levels, and the I/O pin B is referenced to VCCB logic levels. The A pin can accept I/O voltages ranging from 1.1V to 5.5V, while the B port can accept I/O voltages from 1.1V to 5.5V. A high DIR of the Texas Instruments SN74LXCH1T45 allows data transmission from A to B, and a low DIR allows data transmission from B to A
