The UM74AVC4T774 is a 4-bit, dual supply transceiver that enables bidirectional level translation. It features four direction control inputs (DIR1, DIR2, DIR3 and DIR4), an output enable input (/OE) and dual supply pins (VCCA and VCCB). Both VCCA and VCCB can be supplied at any voltage between 1.0 V and 3.6 V making the device suitable for translating between any of the low voltage nodes (1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V). Pins An, /OE and DIRn are referenced to VCCA and pins Bn are referenced to VCCB. A High on DIRn allows transmission from An to Bn and a Low on DIRn allows transmission from Bn to An. The output enable input /OE can be used to disable the outputs so the buses are effectively isolated.

The device is fully specified for partial power-down applications using IOFF. The IOFF circuitry disables the output, preventing any damaging backflow current through the device when it is powered down. In suspend mode when either VCCA or VCCB are at GND level, both An and Bn are in the high-impedance Off-state. 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.

- Each Channel Has an Independent DIR Control Input

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

- 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

- IOFF supports partial power-down mode operation

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

- Latch-up performance exceeds 200 mA per JESD 78

- ESD protection

-- ±8kV Human body model

-- ±2kV Charged-device model

- Enterprise and communications

- Industrial

- Personal electronics

- Wireless infrastructure

- Building automation

- Point of sale