UT3227

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 9

www.unisonic.com.tw

QW-R103-146.a

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MARKING

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PIN CONFIGURATION

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PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

READY

Ready to Transmit Output, Active High. READY is enabled high when V- goes

below -4V and the device is ready to transmit.

2

C1+

Positive terminal of the voltage doubler charge-pump capacitor.

3

V+

+5.5V generated by the charge pump.

4

C1-

Negative terminal of the voltage doubler charge-pump capacitor.

5

C2+

Positive terminal of inverting charge-pump capacitor.

6

C2-

Negative terminal of inverting charge-pump capacitor.

7

V-

-5.5V generated by the charge pump.

8

RS-232 Receiver Input.

9

TTL/CMOS Receiver Output.

10

INVALID

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

receiver inputs logic “1”.

11

TTL/CMOS Transmitter Input.

12

FORCEON

be high) (Table 2).

13

RS-232 Transmitter Output.

14

GND

Ground.

15

+3.0V ~ +5.5V Supply Voltage.

16

FORCEOFF

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

automatic circuitry and FORCEON (Table 2).