ST491A

2/12

PIN CONFIGURATION

PIN DESCRIPTION

TRUTH TABLE (DRIVER)

X= Don’t Care; Z=High Impedance

TRUTH TABLE (RECEIVER)

?= Irrelevant; X= Don’t Care; Z=High Impedance

PlN N°

SYMBOL

NAME AND FUNCTION

1

NC

Not Connected

2

RO

Receiver Output.

3

RE

Receiver Output Enable

4

DE

Driver Output Enable

5

DI

Inverting Driver Input.

6

GND

Ground

7

GND

Ground

8

NC

Not Connected

9

Y

Non-inverting Driver Output

10

Z

Inverting Driver Output

11

B

Inverting Receiver Input

12

A

Non-inverting Receiver Input

13

NC

Not Connected

14

Supply Voltage

INPUT

OUTPUTS

DI

DE

Y

Z

LHL

H

HHH

L

XL

Z

Z

INPUT

OUTPUT

A-B

RE

RO

≥ -0.2V

L

H

between -0.2V to 0.2V

L

?

≤ -0.2V

L

L

OPEN

L

H

XH

Z