Automotive 4-bit bidirectional voltage-level translator with auto direction sensing and +/-15kV ESD

Voltage-level translators address the

challenges posed by simultaneous use of different supply-voltage levels on the same

circuit board. This 4-bit non-inverting translator uses two separate configurable

power-supply rails. 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 1.65V to 5.5V. This allows

for universal low-voltage bidirectional translation between any of the 1.2V, 1.5V,

1.8V, 2.5V, 3.3V, and 5V voltage nodes. VCCA should not exceed

VCCB.

When the output-enable (OE) input is

low, all outputs are placed in the high-impedance state. To establish high-impedance

state during power up or power down, OE should be tied to GND through a pulldown

resistor; the minimum value of the resistor is determined by the current-sourcing

capability of the driver.

The TXB0104 is designed so that the OE

input circuit is supplied by VCCA.

This device is fully specified for

partial-power-down applications using Ioff. The Ioff circuitry

disables the outputs, preventing damaging current backflow through the device when

it is powered down.