PIN

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,

12Mbps, RS-485/RS-422 Transceivers in µMAX Package

_______________________________________________________________________________________

7

______________________________________________________________Pin Description

1

1

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

≥ 200mV, RO goes high; if A - B ≤

-200mV, RO goes low.

—

2

connect to GND for full-duplex mode.

2

—

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

when RE is high. For MAX1481 only, drive RE high and DE low to enter the low-

power shutdown mode.

3

3

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

are high impedance when DE is low.

4

4

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

ing output high. Similarly, a high on DI forces noninverting output high and invert-

ing output low.

5

5

Ground

6

6

Inverting Receiver Input

—

—

Receiver Input Resistors*

7

7

Inverting Driver Output

—

—

Inverting Driver Output and Inverting Receiver Input

8

8

Noninverting Driver Output

—

—

Noninverting Driver Output and Noninverting Receiver Input

9

9

Noninverting Receiver Input

—

—

Receiver Input Resistors*

10

10

Positive Supply; +4.75V

MAX1481/

MAX1484

1

RO

2

H/F

PIN

—

RE

3

DE

4

DI

5

GND

—

B

6

B

—

Z

7

Z

—

Y

8

Y

—

A

9

A

10

MAX1485/MAX1486

FUNCTION

NAME

H/F = 1

*

(MAX1485/MAX1486 only) In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B)

will still have a 1/8-unit load, but are not connected to the receiver.