The SN74LVxTxx family was created to allow up- or down-voltage translation with only one power rail. The family has over-voltage tolerant inputs that allow down translation from up to 5.5 V to the V_CC level that can be as low as 1.8 V. The family SN74LVxTxx also has a lowered switching threshold that allows it to translate up to the V_CC level that can be as high as 5.5 V.