Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com

SP3490_349_02_0270

DESCRIPTION

• Full-Duplex RS-485 and RS-422 Transceivers

• Operates from a single +3.3V Supply

• Interoperable with +5.0V logic

• Driver/Receiver Tri-state Enable Lines (

SP3491)

• -7V to +2V Common-Mode Input Voltage Range

• +/-200mV Receiver Input Sensitivity

• Allows up to 32 transceivers on the serial bus

• Compatability with LTC490 and SN7579 (

SP3490)

• Compatability with LTC49 and SN7580 (

SP3491)

SP3490/SP3491

+3.3V Low Power Full-Duplex RS-485

Transceivers with 10Mbps Data Rate

D

R

A

B

Z

Y

R

GND

2

1

3

4

5

6

7

8

D

The

SP3490 and SP3491 devices are +3.3V low power full-duplex transceivers that meet

the specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin

compatible with the

Exar SP490 and SP49 devices as well as popular industry standards.

The

SP3490 and SP3491 feature Exar's BiCMOS process, allowing low power operation

without sacrificing performance. The

SP3490 and SP3491 meet the electrical specifications

of the RS-485 and RS-422 serial protocols up to 0Mbps under load. The

SP3491 is identical

to the

SP3490 with the addition of driver and reciveiver tri-state enable lines.

SP3490

D

R

NC

A

B

Z

Y

R

NC

NC

DE

REB

GND

GND

2

1

3

4

5

6

7

8

9

10

11

12

13

14

D

SP3491