Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3243E_100_072309

1

SP3243E

3 Driver/5 Receiver Intelligent +3.0V to +5.5V

RS-232 Transceivers

The SP3243E products are 3 driver/5 receiver RS-232 transceiver solutions intended for portable

or hand-held applications such as notebook and palmtop computers. The SP3243E includes one

complementary receiver that remains alert to monitor an external device's Ring Indicate signal while

the device is shutdown. The SP3243E and EB devices feature slew-rate limited outputs for reduced

crosstalk and EMI. The "U" and "H" series are optimized for high speed with data rates up to 1Mbps,

easily meeting the demands of high speed RS-232 applications. The SP3243E series uses an internal

high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This

charge pump and Exar's driver architecture allow the SP3243E series to deliver compliant RS-232

allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is con-

nected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down

drawing less than 1µA.

FEATURES

■ Meets true EIA/TIA-232-F Standards

from a +3.0V to +5.5V power supply

■ Interoperable with EIA/TIA-232 and

adheres to EIA/TIA-562 down to a +2.7V

power source

wakes up from a 1µA shutdown

■ Regulated Charge Pump Yields Stable

RS-232 Outputs Regardless of V

CC

Variations

■ Enhanced ESD Specifications:

+15kV Human Body Model

+15kV IEC1000-4-2 Air Discharge

+8kV IEC1000-4-2 Contact Discharge

■ 250 Kbps min. transmission rate (EB)

■ 1000 Kbps min. transmission rate (EU)

■ Ideal for High Speed RS-232 Applications

DESCRIPTION

SELECTION TABLE

Now Available in Lead Free Packaging

1

2

3

4

25

26

27

28

5

6

7

24

23

22 SHUTDOWN

C2-

V-

ONLINE

C2+

C1-

GND

V+

STATUS

8

9

10

11

18

19

20

21

12

13

14

17

16

SP3243E

C1+

Device

Power

Supplies

RS-232

Drivers

RS-232

Receivers

External

Components

Auto

On-Line

Circuitry

TTL

3-

State

# of

Pins

Data

Rate

ESD

Rating

SP3243E

+3.0V to +5.5V

3

5

4 Capacitors

Yes

Yes

28

120

15kV

SP3243EB +3.0V to +5.5V

3

5

4 Capacitors

Yes

Yes

28

250

15kV

SP3243EH +3.0V to +5.5V

3

5

4 Capacitors

Yes

Yes

28

460

15kV

SP3243EU +3.0V to +5.5V

3

5

4 Capacitors

Yes

Yes

28

1000

15kV