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

TRANSLATION AND 3-STATE OUTPUTS

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 U74AVCH2T45 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

U74AVCH2T45 features active bus- hold circuitry, which holds

unused or un-driven inputs at a valid logic state. Does not

recommend using pull-up or pull-down resistors with the bus-hold

circuitry.

FEATURES

* VCC Isolation

* 2-Rail Design

* I/Os are 4.6V Tolerant

* Partial Power-Down-Mode Operation

* Bus Hold on Data Inputs