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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

DIR

OE

A1

B1

To Seven Other Channels

2

3

22

21

SN74LVC8T245

8-BIT DUAL-SUPPLY BUS TRANSCEIVER

WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS

SCES584A – JUNE 2005 – REVISED AUGUST 2005

The SN74LVC8T245 is designed for asynchronous communication between two data buses. The logic levels of

the direction-control (DIR) input and the output-enable (OE) input activate either the B-port outputs or the A-port

outputs or place both output ports into the high-impedance mode. 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 is always active and must have a logic HIGH or LOW level

preventing damaging current backflow through the device when it is powered down.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

(EACH 8-BIT SECTION)

CONTROL INPUTS

OUTPUT CIRCUITS

OPERATION

OE

DIR

A PORT

B PORT

L

L

Enabled

Hi-Z

B data to A bus

L

H

Hi-Z

Enabled

A data to B bus

H

X

Hi-Z

Hi-Z

Isolation

(1)

Input circuits of the data I/Os are always active.

LOGIC DIAGRAM (POSITIVE LOGIC)

2