The UM74AVC8TX245 is designed for asynchronous communication between two 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 of the direction-control inputs (DIR1 and DIR2). The output-enable (/OE) input can be used to disable the outputs so the buses are effectively isolated. The UM74AVC8TX245 is designed so that the control pins (DIR and /OE) are referenced to VCCA voltage.

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 is designed so that if either VCC input supply is below 100mV, all level shifter outputs are disabled and placed into a high impedance state. To put the device into the high-impedance state during power up or power down, tie /OE to VCC through a pull-up resistor; the current-sinking capability of the driver determines the minimum value of the resistor.

- Control inputs VIH/VIL levels are referenced to VCCA voltage

- Multiple direction-control pins to allow simultaneous up and down translation

- IOFF supports partial power-down mode operation

- VCC isolation feature – if either VCC input is at GND, all are in the high-impedance state

- Fully configurable dual-rail design allows each port to operate over the full 1V to 3.6V power supply range

- Backward compatibility with UM74AVC8T245 device

- Up to 400Mbps support when translating from 1.8V to 3.3V

- Latch-up performance exceeds 800 mA per JESD 78, Class II

- ESD protection

-- ±8kV Human body model

-- ±2kV Charged-device model

- Enterprise and communications

- Industrial

- Personal electronics

- Wireless infrastructure

- Building automation

- Point of sale