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 1.2 V to 3.6 V. The B port is
designed to track VCCB. VCCB accepts any supply voltage from 1.65 V to 5.5
V. This allows for universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V,
1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes. VCCA should not exceed
When the output-enable (OE) input is low, all outputs are placed in the high-impedance
state. To ensure the 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
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.