High-ESD Profibus RS-485 Transceiver

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Pin Configurations

Pin Description

PIN

NAME

FUNCTION

1

RO

Receiver Output. When RE is low and (A - B) R -50mV, RO is high; if (A - B) P -200mV, RO is low.

2

RE

Receiver Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive RE

high and DE low to enter low-power shutdown mode.

3

DE

Driver Enable. Drive DE high to enable driver output. The driver outputs are high impedance when

DE is low. Drive RE high and DE low to enter low-power shutdown mode.

4

DI

Driver Input. With DE high, a low on DI forces the noninverting output, A, low and the inverting out-

put, B, high. Similarly, a high on DI forces the noninverting output, A, high and the inverting output,

B, low.

5

GND

Ground

6

A

Noninverting Receiver Input and Noninverting Driver Output

7

B

Inverting Receiver Input and Inverting Driver Output

8

device.

—

EP

Exposed Pad (TDFN Only). Connect EP to GND.

MAX14770E

+

TOP VIEW

A

GND

8

7

B

SO

6

5

DE

DI

1

2

RO

3

4

RE

1

+

4

3

8

6

5

MAX14770E

2

7

B

A

GND

DI

RO

DE

TDFN

(3mm × 3mm)

*CONNECT EXPOSED PAD TO GND.

*EP

RE