The SN74AHC1G126DBVR is a single Bus Buffer Gate/Line Driver with 3-state output. The output is disabled when the output-enable (OE) input is low. When output-enable is high, true data is passed from the A input to the Y output. To ensure the high-impedance state during power up or power down, output-enable should be tied to GND through a pull-down resistor and the minimum value of the resistor is determined by the current-sourcing capability of the driver.