FUNCTION

MAX481

MAX483

MAX485

MAX487

MAX1487

1

8

2

7

3

6

4

5

Pin Description

PIN

NAME

FUNCTION

MAX481/MAX483/

MAX485/MAX487/

MAX1487

MAX488/

MAX490

MAX489/

MAX491

DIP/SO

µMAX

DIP/SO

µMAX

DIP/SO

1

3

2

4

2

RO

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

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

2

4

—

—

3

RE

Receiver Output Enable. RO is enabled when RE is low; RO is

high impedance when RE is high.

3

5

—

—

4

DE

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

by bringing DE high. They are high impedance 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

RE is low.

4

6

3

5

5

DI

Driver Input. A low on DI forces output Y low and output Z high.

Similarly, a high on DI forces output Y high and output Z low.

5

7

4

6

6, 7

GND

Ground

—

—

5

7

9

Y

Noninverting Driver Output

—

—

6

8

10

Z

Inverting Driver Output

6

8

—

—

—

A

Noninverting Receiver Input and Noninverting Driver Output

—

—

8

2

12

A

Noninverting Receiver Input

7

1

—

—

—

B

Inverting Receiver Input and Inverting Driver Output

—

—

7

1

11

B

Inverting Receiver Input

8

2

1

3

14

—

—

—

—

1, 8, 13

N.C.

No Connect—not internally connected

TOP VIEW

RO 1

RE 2

DE 3

DI 4

R

D

DIP/SO

7

B

6

A

5 GND

RO

1

R

RE 2

DE

3

7 B

Rt

6

MAX481

MAX483

MAX485

DE

MAX487

MAX1487

DI

D

B

Rt

B

RO

RE

A

GND

DI

DE

DI

4

D

A

5 GND

A

RO

R

RE

µMAX

NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.

TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.

Figure 1. MAX481/MAX483/MAX485/MAX487/MAX1487 Pin Configuration and Typical Operating Circuit