The HG74ALVC162835C is an 18-bit universal bus driver designed for 2.3V to 3.6 V VCC Operation. The Output Enable(OE) controls data flow from A to Y. The device operates in transparent mode when the latch-enable(LE) input is high. When LE is low, the A data is latched if the clock input is held at a high or low logic level. If LE is low, the A data is stored in the latch/flip-flop on the low-to-high transition of CLK. When OE is high, the Outputs are in the high impedance state. OE should be tied to VCC through a pull up resistor to ensure the high impedance state during power up or power down.