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

SP3249E_100_013111

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Table 1. Device Pin Description

NAME

FUNCTION

PIN NUMBER

C2+

Positive terminal of the symmetrical charge-pump capacitor C2.

1

GND

Ground.

2

C2-

Negative terminal of the symmetrical charge-pump capacitor C2.

3

V-

Regulated -5.5V output generated by the charge pump.

4

T

RS-232 Driver Output.

5

T

RS-232 Driver Output.

6

T

RS-232 Driver Output.

7

R

RS-232 receiver input.

8

R

RS-232 receiver input.

9

T

RS-232 Driver Output.

10

R

RS-232 receiver input.

11

T

RS-232 Driver Output.

12

T

TTL/CMOS driver input.

13

R

TTL/CMOS receiver output.

14

T

TTL/CMOS driver input.

15

R

TTL/CMOS receiver output.

16

R

TTL/CMOS receiver output.

17

T

TTL/CMOS driver input.

18

T

TTL/CMOS driver input.

19

T

TTL/CMOS driver input.

20

C1-

Negative terminal of the symmetrical charge-pump capacitor C1.

21

Vcc

+3.0V to +5.5V supply voltage.

22

V+

Regulated +5.5V output generated by the charge pump.

23

C1+

Positive terminal of the symmetrical charge-pump capacitor C1.

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