Texas Instruments SN74LV125AT Quad Bus Buffer Gates have independent line drivers with 3-state outputs. Each output is disabled when the associated output-enable (/OE) input is high. The /OE should be tied to VCC through a pull-up resistor to ensure the high-impedance state during power up or down. The driver's current-sinking capability determines the minimum value of the resistor. The Texas Instruments SN74LV125AT is fully specified for partial power-down applications using the Ioff circuitry. When powered down, the Ioff circuitry disables the outputs and prevents a damaging current backflow through the device.
