The NLSX3373 is a 2-bit configurable dual-supply bidirectional auto sensing translator that does not require a directional control pin. The VCC I/O and VL I/O ports are designed to track two different power supply rails, VCC and VL respectively. The VCC supply rail is configurable from 1.65 V to 4.5 V while VL supply rail is configurable to 1.2 V to 4.1 V. This allows lower voltage logic signals on the VL side to be translated into higher voltage logic signals on the VCC side, and vice-versa. The NLSX3373 translator has open-drain outputs with integrated 10 kW pullup resistors on the I/O lines. The integrated pullup resistors are used to pullup the I/O lines to either VL or VCC. The NLSX3373 is an excellent match for open-drain applications such as the I2C communication bus.