The SN74AXC4T245-Q1 AEC-Q100 qualified device is a four-bit non-inverting bus transceiverthat uses two individually configurable power-supply rails. The device is operational with bothVCCA and VCCB supplies as low as 0.65 V. The A portis designed to track VCCA, which accepts any supply voltage from 0.65 V to3.6 V. The B port is designed to track VCCB, which also accepts any supplyvoltage from 0.65 V to 3.6 V. Additionally the SN74AXC4T245-Q1 is compatible with a single-supplysystem.
The SN74AXC4T245-Q1 device is designed for asynchronous communication between data buses.The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending onthe logic level of the direction-control inputs (1DIR and 2DIR). The output-enable inputs(1OE and 2OE) are used to disable the outputs so thebuses are effectively isolated. The SN74AXC4T245-Q1 device is designed so the control pins (xDIRand xOE) are referenced to VCCA.
To ensure the high-impedance state of the level shifter I/Os during power up or powerdown, the xOE pins should be tied to VCCA through apull-up resistor.
This device is fully specified for partial-power-down applications using theIoff current. The Ioff protection circuitry ensuresthat no excessive current is drawn from or to an input, output, or combined I/O that is biased to aspecific voltage while the device is powered down.
The VCC isolation feature ensures that if eitherVCCA or VCCB is less than 100 mV, both I/O portsenter a high-impedance state by disabling their outputs.
Glitch-Free power supply sequencing allows either supply rail to be powered on or off inany order while providing robust power sequencing performance.