1

10/16/02

SP3493/3494 +3.3V Low Power Slew-Rate Limited RS-485/RS-422 Transceivers

© Copyright 2002 Sipex Corporation

■ Operates From A Single +3.3V Supply

■ Interoperable With +5V Logic

■ +200mV Receiver Input Sensitivity

■ -7V to +12V Common-Mode Input

Voltage Range

■ Devices Allow Up To 32 Transceivers

On The Serial Bus

■ Driver/Receiver Enable Lines (SP3494)

■ 2nA Low-Power Shutdown Mode (SP3494)

■ Compatible With The MAX3488, LTC490

and 75179 Industry Standard Pinouts

(SP3493)

■ Compatible With The MAX3486 and 75176

Industry Standard Pinouts (SP3494)

+3.3V Low Power

RS-485/RS-422 Transceivers

SP3493/SP3494

DESCRIPTION

The SP3493 and the 3494 devices are +3.3V, low power transceivers that meet the

specifications of the RS-485 and RS-422 serial protocols. The SP3493 and the 3494 devices

are pin-to-pin compatible with the Sipex SP3490 and the SP3481 devices, respectively, as well

as other popular industry standards. The devices feature Sipex's BiCMOS process, allowing

low power operation without sacrificing performance. The partially slew-rate limited drivers

minimize EMI and reduce reflections caused by improperly terminated cables allowing

error-free data transmission. The SP3493 is a full-duplex low power transceiver that will

deliver a data transmission rate up to 250kbps. The SP3494 is a half-duplex partially slew-rate

limited transceiver that will deliver a data transmission rate up to 2.5Mbps. The SP3494 is

equipped with a low-power shutdown mode and driver/receiver high-Z enable lines.

1

2

3

4

5

6

7

8

R

D

Vcc

GND

R

D

A

B

Z

Y

RO 1

RE 2

DE 3

DI 4

8

7

B

6

A

5

GND

D

R

SP3493

SP3494

®