UT3223

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 9

www.unisonic.com.tw

QW-R502-A91.e

■

MARKING



PIN CONFIGURATION

1

C2+

2

C2-

3

V-

4

5

6

7

8

9

10

20

C1+

19

V+

18

17

GND

16

C1-

15

FORCEON

14

13

12

11

UTC

UT3223

INVALID

FORCEOFF

EN



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

EN

Receiver Enable Control. Drive low for normal operation. Drive high to force the

receiver outputs (R_OUT) into a high-impedance state.

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 Transmitter 2 Output.

9

RS-232 Receiver 2 Input.

10

TTL/CMOS Receiver 2 Output.

11

INVALID

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

receiver inputs logic “1”.

12

TTL/CMOS Transmitter 2 Input.

13

TTL/CMOS Transmitter 1 Input.

14

FORCEON

be high) (Table 2).

15

TTL/CMOS Receiver 1 Output.

16

RS-232 Receiver 1 Input.

17

RS-232 Transmitter 1 Output.

18

GND

Ground.

19

+3.0V ~ +5.5V Supply Voltage.

20

FORCEOFF

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

automatic circuitry and FORCEON (Table 2).