UT3243

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 9

www.unisonic.com.tw

QW-R502-573.F



PIN CONFIGURATION

1

C2+

2

C2-

3

V-

4

5

6

7

8

9

10

11

12

13

14

28 C1+

27 V+

25 GND

24 C1-

23 FORCEON

22 FORCEOFF

21 INVALID

UTC

UT3243



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

C2+

Positive terminal of inverting charge-pump capacitor

2

C2-

Negative terminal of inverting charge-pump capacitor

3

V-

-5.5V generated by the charge pump

4~8

RS-232 Receiver Inputs

9~11

RS-232 Transmitter Outputs

12~14

TTL/CMOS Transmitter Inputs

15~19

TTL/CMOS Receiver Outputs

20

Noninverting Receiver Output—active in shutdown

21

INVALID

Output of the valid signal detector. Indicates if a valid RS-232 level is present on

receiver inputs logic “1”.

22

FORCEOFF

Drive low to shut down transmitters and on-board power supply. This over-rides all

automatic circuitry and FORCEON (Table 1).

23

FORCEON

be high) (Table 1).

24

C1-

Negative terminal of the voltage doubler charge-pump capacitor

25

GND

Ground

26

+3.0V ~ +5.5V Supply Voltage

27

V+

+5.5V generated by the charge pump

28

C1+

Positive terminal of the voltage doubler charge-pump capacitor