SN74LVCH245APW (TEXAS INSTRUMENTS)

The SN74LVCH245APW is an Bus Transceiver with 3-state outputs and designed for 1.65 to 3.6V VCC operation. Inputs can be driven from either 3.3/5V devices. This feature allows the use of this device as translators in a mixed 3.3/5V system environment. It is designed for asynchronous communication between data buses. This device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. It is fully specified for partial-power-down applications using IOFF. The IOFF circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pull-up resistor and the minimum value of the resistor is determined by the current-sinking capability of the driver.