±15kV ESD-Protected, ±60V Fault-Protected,

10Mbps, Fail-Safe RS-485/J1708 Transceivers

10

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Pin Description

PIN

MAX3440E

MAX3441E

MAX3442E

MAX3443E

MAX3444E

NAME

FUNCTION

1

——

FAULT

Fault output. 1 = fault; 0 = normal operation

A or B under the following conditions:

• A-B differential <200mV

• A shorted to B

• A shorted to a voltage within the common-mode range

(detected only when the driver is enabled)

• B shorted to a voltage within the common-mode range

(detected only when the driver is enabled)

• A or B outside the common-mode range

21

1

RO

Receiver Output. If receiver enabled and (A-B)

≥ -50mV,

RO = high; if (A-B)

≤ -200mV, RO = low.

—

22

RE

Receiver Output Enable. Pull RE low to enable RO.

——

3

DE

Driver Output Enable. Pull DE low to enable the outputs.

Force DE high to three-state the outputs. Drive RE and DE

high to enter low-power shutdown mode.

3

——

DE/RE

Driver/Receiver Output Enable. Pull DE/RE low to three-

state the driver output and enable RO. Force DE/RE high to

enable driver output and three-state RO.

—

3

—

DE

Driver Output Enable. Force DE high to enable driver. Pull

DE low to three-state the driver output. Drive RE high and

pull DE low to enter low-power shutdown mode.

44

—

DI

Driver Input. A logic low on DI forces the noninverting

output low and the inverting output high. A logic high on

DI forces the noninverting output high and the inverting

output low.

——

4

TXD

J1708 Input. A logic low on TXD forces outputs A and B to

the dominant state. A logic high on TXD forces outputs A

and B to the recessive state.

5

5

5

GND

Ground

6

6

6

A

Noninverting Receiver Input/Driver Output

7

7

7

B

Inverting Receiver Input/Driver Output

88

8