±15kV ESD-Protected, Slew-Rate-Limited,

Low-Power, RS-485/RS-422 Transceivers

_______________________________________________________________________________________

7

______________________________________________________________Pin Description

1

2

Receiver Output: If A > B by 200mV, RO will be high;

If A < B by 200mV, RO will be low.

2

—

Receiver Output Enable. RO is enabled when

–

R

—

E

–

is

low; RO is high impedance when

–

R

—

E

–

is high.

3

—

Driver Output Enable. The driver outputs, Y and Z, are

enabled by bringing DE high. They are high imped-

ance when DE is low. If the driver outputs are enabled,

the parts function as line drivers. While they are high

impedance, they function as line receivers if

–

R

—

E

–

is low.

4

3

Driver Input. A low on DI forces output Y low and out-

put Z high. Similarly, a high on DI forces output Y high

and output Z low.

6

—

Noninverting Receiver Input and Noninverting Driver

Output

—

6

Inverting Driver Output

—

5

Noninverting Driver Output

5

4

Ground

—

—

No Connect—not internally connected

8

1

Positive Supply: 4.75V

—

7

Inverting Receiver Input

7

—

Inverting Receiver Input and Inverting Driver Output

—

8

Noninverting Receiver Input

PIN

2

3

4

5

—

10

9

6, 7

1, 8, 13

14

11

—

12

RO

–

R

—

E

–

DE

DI

A

Z

Y

GND

N.C.

B

B

A

FUNCTION

MAX489E

MAX491E

NAME

MAX488E

MAX490E

MAX481E/MAX483E

MAX485E/MAX487E

MAX1487E