8-BIT BIDIRECTIONAL LEVEL-SHIFTING AND VOLTAGE TRANSLATOR WITH AUTO-DIRECTION SENSING

DESCRIPTION

This 8-bit noninverting 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.

The UTXB0108 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.

To ensure the high-impedance state during power-up or

power-down, OE should be tied to GND through a pull-down

resistor; the minimum value of the resistor is determined by the

current-sourcing capability of the driver.

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FEATURES

* 1.2V to 3.6V on A port and 1.65V to 5.5V on B Port (VCCA ≤ VCCB)

* VCC Isolation Feature – If Either VCC Input Is at GND, All Outputs Are in the High-Impedance State

* OE Input Circuit Referenced to VCCA

* Low Power Consumption, 4μA Max. ICC

* IOFF Supports Partial-Power-Down Mode Operation

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APPLICATION

* Handset

* Smartphone

* Tablet

* Desktop PC