TEXAS INSTRUMENTS SN54AC245/SN74AC245 Manual
User Manual
The 'AC245 octal bus transceivers are designed for asynchronous two-way communication between data buses. It operates in the voltage range of 2V to 6V and accepts input voltages up to 6V. The control-function implementation minimizes external timing requirements. When the output-enable (OE) is low, the device passes noninverted 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. A high on OE disables the device so that the buses are effectively isolated. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.