UT3238

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

3 of 10

www.unisonic.com.tw

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PIN CONFIGURATION

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PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

C2+

Positive terminal of inverting charge-pump capacitor

2

GND

Ground

3

C2-

Negative terminal of inverting charge-pump capacitor

4

V-

-5.5V generated by the charge pump

5~7,10,12

RS-232 Transmitter Outputs

8,9,11

RS-232 Receiver Inputs

13

FORCEON

must be high) (Table 2).

14

FORCEOFF

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

all automatic circuitry and FORCEON (Table 2).

15

INVALID

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

receiver inputs logic “1”.

16

Noninverting Receiver Output—active in shutdown

17,19,22~24

TTL/CMOS Transmitter Inputs

18,20,21

TTL/CMOS Receiver Outputs

25

C1-

Negative terminal of the voltage doubler charge-pump capacitor

26

+3.3V ~ +5.0V Supply Voltage

27

V+

+5.5V generated by the charge pump

28

C1+

Positive terminal of the voltage doubler charge-pump capacitor