SN74LVC2T45DCTT datasheet(2/25 Pages) TI

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

DIR

VCCA

VCCB

SN74LVC2T45

DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER

WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS

SCES516I – DECEMBER 2003 – REVISED MARCH 2007

The SN74LVC2T45 is designed for asynchronous communication between two data buses. The logic levels of

the direction-control (DIR) 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 ICC and ICCZ.

The SN74LVC2T45 is designed so that the DIR 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.

The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state.

NanoFree™ package technology is a major breakthrough in IC packaging concepts, using the die as the

package.

FUNCTION TABLE(1)

(EACH TRANSCEIVER)

INPUT

OPERATION

DIR

B data to A bus

A data to B bus

(1)

Input circuits of the data I/Os

always are active.

LOGIC DIAGRAM (POSITIVE LOGIC)

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