_______________________________________________________________________________________ 9

+5.0V, ±30kV ESD-Protected, Fail-Safe,

Hot-Swap, RS-485/RS-422 Transceiver

Pin Configuration

Pin Description

Function Tables

R

D

RO

DI

B

A

GND

8

7

6

5

1

+

2

3

4

SO/PDIP

RE

DE

PIN

NAME

FUNCTION

1

RO

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

2

RE

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 is a hot-swap input (see the Hot-Swap

Capability section for details).

3

DE

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 is a hot-swap

input (see the Hot-Swap Capability section for details).

4

DI

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

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

5

GND

Ground

6

A

Noninverting Receiver Input and Noninverting Driver Output

7

B

Inverting Receiver Input and Inverting Driver Output

8

TRANSMITTING

INPUTS

OUTPUTS

RE

DE

DI

B

A

X

1

1

0

1

X

1

0

1

0

0

0

X

High-Z

High-Z

1

0

X

Shutdown

RECEIVING

INPUTS

OUTPUTS

RE

DE

A-B

RO

0

X

R

-50mV

1

0

X

P

-200mV

0

0

X

Open/shorted

1

1

1

X

High-Z

1

0

X

Shutdown