Rev. 6/19/03

SP3281EB Intelligent +2.35V to +5.5V RS-232 Transceivers

© Copyright 2003 Sipex Corporation

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Table 2. Device Pin Description

PIN DESCRIPTION

NAME

FUNCTION

PIN NO.

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 -4.0V or -5.5V output generated by the charge pump.

4

RS-232 driver output.

5

RS-232 driver output.

6

RS-232 driver output.

7

RS-232 receiver input.

8

RS-232 receiver input.

9

RS-232 driver output.

10

RS-232 receiver input.

11

RS-232 driver output.

12

ONLINE

(SHUTDOWN must also be logic HIGH, refer to Table 2).

13

SHUTDOWN

Apply logic LOW to shut down drivers and charge pump.

14

STATUS

TTL/CMOS Output indicating if a RS-232 signal is present on any Rx input.

15

Logic level supply voltage selection

16

TTL/CMOS driver input.

17

TTL/CMOS receiver output.

18

TTL/CMOS driver input.

19

TTL/CMOS receiver output.

20

TTL/CMOS receiver output.

21

TTL/CMOS driver input.

22

TTL/CMOS driver input.

23

TTL/CMOS driver input.

24

C1-

Negative terminal of the symmetrical charge-pump capacitor C1.

25

+2.35V to +5.5V supply voltage.

26

V+

Regulated +4.0V or +5.5V output generated by the charge pump.

27

C1+

Positive terminal of the symmetrical charge-pump capacitor C1

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