ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491

FN6046 Rev 9.00

Page 3 of 18

February 16, 2016

Truth Tables

Pinouts

ISL8483, ISL8485 (PDIP, SOIC)

TOP VIEW

ISL8488, ISL8490 (PDIP, SOIC)

TOP VIEW

ISL8489, ISL8491 (PDIP, SOIC)

TOP VIEW

RO

RE

DE

DI

1

2

3

4

8

7

6

5

B/Z

A/Y

GND

D

R

RO

DI

GND

1

2

3

4

8

7

6

5

A

B

Z

Y

D

R

NC

RO

RE

DE

DI

GND

GND

NC

A

B

Z

Y

NC

1

2

3

4

5

6

7

14

13

12

11

10

9

8

D

R

TRANSMITTING

INPUTS

OUTPUTS

RE

DE

DI

Z

Y

X

1101

X

1010

0

0

X

High-Z

High-Z

1

0

X

High-Z *

High-Z *

*Shutdown Mode for ISL8483 (see Note 7)

RECEIVING

INPUTS

OUTPUT

RE

DE

Half Duplex

DE

Full Duplex

A-B

RO

00

X

 +0.2V

1

00

X

 -0.2V

0

0

0

X

Inputs Open

1

100

X

High-Z *

111

X

High-Z

*Shutdown Mode for ISL8483 (see Note 7)

Pin Descriptions

PIN

FUNCTION

RO

Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating).

RE

Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.

DE

Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.

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.

GND

Ground connection.

A/Y

Noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1.

B/Z

Inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1.

A

Noninverting receiver input.

B

Inverting receiver input.

Y

Noninverting driver output.

Z

Inverting driver output.

System power supply input (4.5V to 5.5V).

NC

No Connection.