2-BIT DUAL SUPPLY, BUS TRANSCEIVER WITH CONFIGURABLE LEVEL-SHIFTING AND TRANSLATION

DESCRIPTION

This 2-bit non-inverting bus transceiver uses two separate

configurable power-supply rails. The A ports are designed to track

VCCA and accepts any supply Voltage from 1.2V to 3.6V. The B

ports are designed to track VCCB and accepts any supply Voltage

from 1.2V to 3.6V. This allows for universal low Voltage

bidirectional translation and level-shifting between any of the 1.2V,

1.5V, 1.8V, 2.5V, and 3.3V Voltage nodes.

The U74AVC2T45 is designed for asynchronous

communication between two data buses. The logic levels of the

direction-control (DIR pin) input activate either the B-port outputs or

the A-port outputs. The device transmits data from the A bus to the

B bus when the B-port outputs are activated and from the B bus to

the A bus when the A-port outputs are activated. The input circuitry

on both A and B ports always is active and must have a logic HIGH

or LOW level applied to prevent excess leakage current on the

internal CMOS structure.

FEATURES

* VCC Isolation Feature: If Either VCC Input Is at GND, Both Ports  Are in the High-Impedance State

* Dual Supply Rail Design

* I/Os Are 4.6V Over Voltage Tolerant

* IOFF Supports Partial-Power-Down Mode Operation