Diodes offers their 74AVC1T45, single-bit voltage translator where the A input-to-output pin is designed to track V_CC(A) while the B input-to-output pin tracks V_CC(B). This arrangement allows for universal, low-voltage translation between any voltages from 1.2 V to 3.6 V.

The direction of the transceiver is controlled by the direction pin (DIR) that has logic threshold voltages related to V_CC(A). When a high logic level is applied to DIR the A-pin becomes an input and the B-pin becomes the output.

Conversely the roles of A and B are reversed when DIR is asserted low.