DESCRIPTION

The UTC U74AVC8T245 is an 8-bit dual supply transceiver that

enables bidirectional level translation. The U74AVC8T245 is

optimized to operate with VCCA/VCCB set at 1.4V to 3.6V. The device

is operational with VCCA/VCCB as low as 1.2 V. The A port is designed

to track VCCA. VCCA accepts any supply voltage from 1.2V to 3.6V.

The B port is designed to track VCCB. VCCB accepts any supply

voltage from 1.2 V to 3.6 V. This allows for universal low-voltage

bidirectional translation between any of the 1.2V, 1.5V, 1.8V, 2.5V,

and 3.3V voltage nodes.

Data can be transmitted by the U74AVC8T245 from the A bus to the B bus or from the B bus to the A bus,

depending on the logic level at the direction-control (DIR) input, as it is designed for asynchronous communication

between data buses. The output-enable ( OE ) input can also be used to disable the outputs, effectively isolating the

buses

The U74AVC8T245 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 on the logic level at the direction-control

(DIR) input. The output-enable ( OE ) input can be used to disable the outputs so the buses are effectively isolated.

The U74AVC8T245 is designed so that the control pins (DIR and OE ) are supplied by VCCA.

The U74AVC8T245 solution is compatible with a single-supply system and can be replaced later with a '245

function, with minimal printed circuit board redesign.

This device is fully specified for partial-power-down applications using IOFF. The IOFF circuitry disables the outputs,

thus preventing damaging current backflow through the device when it is powered down.

The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state.

To ensure the high-impedance state during power up or power down, OE shall be tied to VCC through a pull-up

resistor the minimum value of the resistor is determined by the current-sinking capability of the driver.