SCES878 March 2019 SN74AXCH4T245
The SN74AXCH4T245 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device with bus-hold inputs. xAx pins and control pins (1DIR, 2DIR, 1OE, and 2OE) are reference to VCCA logic levels, and xBx pins are referenced to VCCB logic levels. The A port is able to accept I/O voltages ranging from 0.65 V to 3.6 V, while the B port can accept I/O voltages from 0.65 V to 3.6 V. A high on DIR allows data transmission from A to B and a low on DIR allows data transmission from B to A when OE is set to low. When OE is set to high, both xAx and xBx pins are in the high-impedance state. See Device Functional Modes for a summary of the operation of the control logic.