Texas Instruments' SN74AXC1T45 are single-bit noninverting bus transceivers that use two separate configurable power-supply rails. The devices are operational with both V_CCA and V_CCB supplies as low as 0.65 V. The A port is designed to track V_CCA, which accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track V_CCB, which also accepts any supply voltage from 0.65 V to 3.6 V.

The DIR pin determines the direction of signal propagation. With the DIR pin configured HIGH, translation is from Port A to Port B. With DIR configured LOW, translation is from Port B to Port A. The DIR pin is referenced to V_CCA, meaning that its logic-high and logic-low thresholds track with V_CCA.

These devices are fully specified for partial-power-down applications using the I_off current. The I_off protection circuitry ensures that no excessive current is drawn from or to an input, output, or combined I/O that is biased to a specific voltage while the device is powered down.

The V_CC isolation feature ensures that if either V_CCA or V_CCB is less than 100 mV, both I/O ports enter a high-impedance state by disabling their outputs.

Glitch-free supply sequencing permits either supply rail to be powered on or off, in any order, without producing a data glitch (that is an output waveform that momentarily transitions from logic low to logic high).