SN54LVTH245A, SN74LVTH245A

3.3-V ABT OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS130T − MAY 1992 − REVISED SEPTEMBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

These devices are designed for asynchronous communication between data buses. They transmit 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 devices so the buses are effectively isolated.

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

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup

or pulldown resistors with the bus-hold circuitry is not recommended.

disables the outputs, preventing damaging current backflow through the devices when they are powered down.

The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,

which prevents driver conflict.

terminal assignments

1234

A

A1

DIR

OE

B

A3

B2

A2

B1

C

A5

A4

B4

B3

D

A7

B6

A6

B5

E

GND

A8

B8

B7

FUNCTION TABLE

INPUTS

OPERATION

OE

DIR

OPERATION

L

L

B data to A bus

L

H

A data to B bus

H

X

Isolation

logic diagram (positive logic)

DIR

OE

A1

B1

To Seven Other Channels

1

2

19

18

Pin numbers shown are for the DB, DW, FK, J, NS, PW, RGY, and W packages.

SN74LVTH245A . . . GQN OR ZQN PACKAGE

(TOP VIEW)

1

234

A

B

C

D

E