ST3485EB, ST3485EC, ST3485EI, ST3485EIY

Pin configuration

DocID9102 Rev 11

3/24

1

Pin configuration

Figure 1: Pin connections

Table 2: Pin description

Pin n°

Symbol

Name and function

1

RO

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

mV, RO will be low.

2

RE

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.

3

DE

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.

4

DI

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

VCC

RO

RE

DE

DI

VCC

GND

B

A

1

2

3

4

8

7

6

5