The SN74LXCH8T245 is an 8-bit translating transceiver that uses two individually configurable power-supply rails. The device is operational with V_CCA and V_CCB supplies as low as 1.1 V and as high as 5.5 V. Additionally, the device operates with V_CCA = V_CCB. The A port is designed to track V_CCA, and the B port is designed to track V_CCB.

The SN74LXCH8T245 device is designed for asynchronous communication between data buses and transmits data from the A bus to the B bus or from the B bus to the A bus based on the logic level of the direction-control input (DIR). The output-enable input (OE) is used to disable the outputs so the buses are effectively isolated. The control pins of the SN74LXCH8T245 (DIR and OE) are referenced to V_CCA. The OE pin should be tied to V_CCA through a pullup resistor to ensure the high-impedance state of the level shifter I/Os during power up or power down.

This device is 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 sourced into an input, output, or I/O while the device is powered down.

The V_CC isolation and V_CC disconnect feature ensures that if either V_CC is less than 100 mV or floating with the complementary supply within the recommended operating conditions, both I/O ports are set to the high-impedance state by disabling their outputs and the supply current is maintained.

Glitch-free power supply sequencing allows either supply rail to power on or off in any order while providing robust power sequencing performance.