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

SP3238E_100_020111

1

SP3238E

Intelligent +3.0V to +5.5V RS-232 Transceiver

The SP3238E device is an RS-232 transceiver solution intended for portable or hand-held applications

such as notebook and palmtop computers. The SP3238E 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 SP3238E device to deliver compliant RS-232 performance from a single power

supply ranging from +3.0V to +5.5V. The SP3238E is a 5-driver / 3-receiver device that is ideal for laptop

/ notebook computer and PDA applications. The SP3238E includes one complementary receiver that

remains alert to monitor an external device's Ring Indicate signal while the device is shutdown.

The

when an RS-232 cable is connected 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

■ Minimum 250Kbps data rate under load

■ Regulated Charge Pump Yields Stable

RS-232 Outputs Regardless of V

CC

Variations

■ Enhanced ESD Specifications:

+15kV Human Body Model

+15kV IEC61000-4-2 Air Discharge

+8kV IEC61000-4-2 Contact Discharge

DESCRIPTION

SELECTION TABLE

Now Available in Lead Free Packaging

T4IN

1

2

3

4

25

26

27

28

5

6

7

24

23

22

SHUTDOWN

C2-

V-

R1IN

R2IN

IN

ONLINE

C2+

C1-

GND

V+

T1IN

8

9

10

11

18

19

20

21

12

13

14

17

16

15

T OUT

T2OUT

T3OUT

T3IN

T2IN

T5IN

R3OUT

R2OUT

R1OUT

R1OUT

SP3238E

C1+

T4OUT

T5OUT

STATUS

1

3

R

Device

Power

Supplies

RS-232

Drivers

RS-232

Receivers

External

Components

Auto

On-Line

Circuitry

TTL 3-State

# of

Pins

SP3220E

+3.0V to +5.5V

1

1

4 Capacitors

No

Yes

16

SP3223E

+3.0V to +5.5V

2

2

4 Capacitors

Yes

Yes

20

SP3243E

+3.0V to +5.5V

3

5

4 Capacitors

Yes

Yes

28

SP3238E

+3.0V to +5.5V

5

3

4 Capacitors

Yes

Yes

28