© 2014 Exar Corporation

XR32430/XR32431

3-Driver/5-Receiver Intelligent RS-232 Transceiver

with 1.65V-5.5V Interface

exar.comXR32430_XR32431

Rev 1A

1 / 13

General Description

The XR32430 and XR32431 products are 3 driver/ 5 receiver

RS-232 transceivers. The XR32431 features a variable low volt-

age logic interface, down to 1.65V. These products are intended

for portable or hand-held applications such as notebook and

palmtop computers. The XR32430EB and XR32431EB devices

feature slew-rate limited outputs for reduced crosstalk and EMI.

The XR32430EH and XR32431EH devices are optimized for mid

speed applications, with data rates up to 460Kbps. The

XR32430EU and XR32431EU devices are optimized for high

speed designs with data rates up to 1Mbps, easily meeting the

demands of high speed RS-232 applications.

The XR32430/31 uses an internal high-efficiency charge-pump

power supply that requires only four 0.1μF capacitors in 3.3V

operation. This charge pump combined with Exar's driver archi-

tecture allow the XR32430/31 to deliver compliant RS-232 perfor-

mance from a single power supply ranging from +3.0V to +5.5V.

The AUTO ON-LINE® feature 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

• AUTO ON-LINE circuitry automatically wakes up

from a 1

A shutdown

• Regulated Charge Pump yields stable RS-232

• Enhanced ESD Specifications

•

±15kV Human Body Model

•

±15kV IEC61000-4-2 Air Discharge

•

±8kV IEC61000-4-2 Contact Discharge

• 250Kbps/460Kbps/1Mbps min transmission

rates (speed grades B/H/U)

• -40°C to 85°C ambient operating temperature

• Lead-free (RoHS 6) package

APPLICATIONS

• Industrial and Single Board Computers

• Industrial and Process Control Equipment

• Point-Of-Sales Equipment

• Building Security and Automation

Ordering Information – page 13

Typical XR32431 Application and Package Pinout

T3OUT

T2OUT

T2IN

T3IN

R2IN

R2OUT

R2OUT

Shutdown

OnLine

Status

Charge

Pump

C1+

C1-

C2+

C2-

V+

V-

RS-232

Outputs

RS-232

Inputs

TTL/CMOS

Inputs

TTL/CMOS

Outputs

Auto On-line /

Control

5K



T1OUT

T1IN

R1IN

R1OUT

5K



R4IN

R5IN

R4OUT

R5OUT

5K



5K



R3IN

R3OUT

5K



0.1

F

0.1

F

25

26

0.1

F

0.1

F

0.1

F

0.1

F

To

-P Supervisor

Circuit

23

28

29

30

30

26

22

21

20

1

2

3

4

5

6

7

8

12

11

10

18

17

19

15

14

13

24

1

2

3

4

5

17

6

18

R1IN

R2IN

T1OUT

T2OUT

R1OUT

C1-

GND

25

26

27

29

30

31

32

28

R3IN

R4IN

R5IN

T3OUT

R2OUT

R2OUT

XR32431

32 pin QFN (5x5mm)