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

SP3222EU/SP3232EU_102_031413

5

Table 1. Device Pin Description

NAME

FUNCTION

PIN NUMBER

SP3222EU

SP3232EU

SOIC

SSOP

TSSOP

EN

Receiver Enable. Apply Logic LOW for normal operation.

Apply logic HIGH to disable the receiver outputs (high-Z state)

1

1

-

C1+

Positive terminal of the voltage doubler charge-pump capacitor

2

2

1

V+

+5.5V output generated by the charge pump

3

3

2

C1-

Negative terminal of the voltage doubler charge-pump capacitor

4

4

3

C2+

Positive terminal of the inverting charge-pump capacitor

5

5

4

C2-

Negative terminal of the inverting charge-pump capacitor

6

6

5

V-

-5.5V output generated by the charge pump

7

7

6

T

RS-232 driver output.

15

17

14

T

RS-232 driver output.

8

8

7

R

RS-232 receiver input

14

16

13

R

RS-232 receiver input

9

9

8

R

TTL/CMOS receiver output

13

15

12

R

TTL/CMOS receiver output

10

10

9

T

TTL/CMOS driver input

12

13

11

T

TTL/CMOS driver input

11

12

10

GND

Ground

16

18

15

V

CC

+3.0V to +5.5V supply voltage

17

19

16

SHDN

Shutdown Control Input. Drive HIGH for normal device operation.

Drive LOW to shutdown the drivers (high-Z output) and the on-

board power supply

18

20

-

N.C.

No Connect

-

11, 14

-

PIN FUNCTION