The SN74HC541 device has 8 inputs and outputs where data from the A inputs go to the Y outputs. The output enables of the device control whether the information from the A inputs go to the Y outputs. These enable pins cause the device to go into high Z if either OE1 or OE2 are high. The OEs should be tied to V_CC through a pull up resistor to ensure the high impedance state during power up or power down; the minimum value of the resistor is determined by the current sinking capability of the driver.