Quadruple Bus Buffer Gates With 3-State Outputs

The AHCT126 devices are quadruple bus Buffer Gates featuring independent Line Drivers with 3-state outputs. Each output is disabled when the associated output-enable (OE) input is low. When OE is high, the respective Gate passes the data from the A input to its Y output.
To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.
By Texas Instruments