The SNx4HCT244 device is organized as two 4-bit buffers and line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. For the high-impedance state during power up or power down, OE must be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.