Fail-Safe, High-Speed (10Mbps),

Slew-Rate-Limited RS-485/RS-422 Transceivers

10

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Pin Description

PIN

—

9

5

—

Noninverting Driver Output

Y

9

5

6

7

5

6

7

3

—

4

4

—

5

Driver Input. With DE high, a low on DI forces noninverting output

low and inverting output high. Similarly, a high on DI forces non-

inverting output high and inverting output low.

DI

5

Slew-Rate-Limit Selector Pin. Connect SRL to GND for 10Mbps

rate. Leave unconnected for 115kbps communication rate.

SRL

—

Ground

GND

6, 7

8

8

—

—

TXP

—

4

4

—

3

Driver Output Enable. Drive DE high to enable driver outputs. These

outputs are high impedance when DE is low. Drive RE high and DE

low to enter low-power shutdown mode.

DE

4

2

3

HALF-

DUPLEX

MODE

1

MAX3089

2

3

FULL-

DUPLEX

MODE

1

2

—

FULL-DUPLEX

DEVICES

—

MAX3081

MAX3084

MAX3087

1

2

HALF-

DUPLEX

DEVICES

—

MAX3082

MAX3085

MAX3088

Receiver Output. When RE is low and if A - B

≥ -50mV, RO will be

high; if A - B

≤ -200mV, RO will be low.

RO

2

Receiver Output 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.

RE

3

FUNCTION

NAME

mode; connect to GND or leave unconnected for full-duplex mode.

H/F

—

MAX3080

MAX3083

MAX3086

Transmitter Phase. Connect TXP to GND, or leave floating for normal

phase/polarity.

—

—

—

—

9

Y

Noninverting Receiver Input and Noninverting Driver Output*

10

6

—

10

—

Z

Inverting Driver Output

—

—

—

—

10

Z

Inverting Receiver Input and Inverting Driver Output*

11

7

—

11

—

B

Inverting Receiver Input

—

—

—

—

11

B

Receiver Input Resistors*

—

—

7

—

—

B

Inverting Receiver Input and Inverting Driver Output

PIN