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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

DIR

OE

A1

B1

To Seven Other Channels

2

3

22

21

SN74AVCH8T245

8-BIT DUAL-SUPPLY BUS TRANSCEIVER

WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS

SCES565G – APRIL 2004 – REVISED MARCH 2007

The SN74AVCH8T245 is designed for asynchronous communication between data buses. The device transmits

data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the

direction-control (DIR) input. The output-enable (OE) input can be used to disable the outputs so the buses are

effectively isolated.

The SN74AVCH8T245 solution is compatible with a single-supply system and can be replaced later with a '245

function, with minimal printed circuit board redesign.

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

state. The bus-hold circuitry on the powered-up side always stays active.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown

resistors with the bus-hold circuitry is not recommended.

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

FUNCTION TABLE

(each 8-bit section)

INPUTS

OPERATION

OE

DIR

L

L

B data to A bus

L

H

A data to B bus

H

X

All output Hi-Z

LOGIC DIAGRAM (POSITIVE LOGIC)

2

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