ST3485E

2/16

PIN CONFIGURATION

PIN DESCRIPTION

TRUTH TABLE (DRIVER)

X= Don’t Care; Z=High Impedance

TRUTH TABLE (RECEIVER)

X= Don’t Care; Z=High Impedance

PlN N°

SYMBOL

NAME AND FUNCTION

1RO

Receiver Output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be

low

2RE

Receiver Output Enable. RO is enabled when RE is low; RO is high impedance

when RE is high. If RE is high and DE is low, the device will enter a low power

shutdown mode.

3DE

Driver Output Enable. The driver outputs are enabled by bringing DE high. They

are high impedance when DE is low. If RE is high DE is low, the device will enter a

low-power shutdown mode. If the driver outputs are enabled, the part functions as

line driver, while they are high impedance, it functions as line receivers if RE is

low.

4DI

Driver Input. A low on DI forces output A low and output B high. Similarly, a high

on DI forces output A high and output B low

5

GND

Ground

6

A

Non-inverting Receiver Input and Non-inverting Driver Output

7

B

Inverting Receiver Input and Inverting Driver Output

8

INPUTS

OUTPUTS

MODE

RE

DE

DI

B

A

X

H

H

L

H

Normal

X

H

L

H

L

Normal

L

L

X

Z

Z

Normal

H

L

X

Z

Z

Shutdown

INPUTS

OUTPUT

MODE

RE DE

A-B

RO

LL

≥ -0.015V

H

Normal

LL

≤ -0.2V

L

Normal

L

L

Inputs Open

H

Normal

L

L

Inputs Shorted

H

Normal

H

L

X

Z

Shutdown