UT3222

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R502-986.a



PIN CONFIGURATION

9

8

7

6

5

4

3

2

1

18

17

16

14

15

13

12

11

10

19

20

EN

C1+

V+

C1-

C2+

C2-

V-

DOUT2

RIN2

ROUT2

NC

DOUT1

ROUT1

NC

DIN1

DIN2

RIN1

GND

PWRDOWN



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

EN

Receiver Enable. Active low.

2

C1+

Positive Terminal of Voltage-Doubler Charge-Pump Capacitor

3

V+

+5.5V Generated by the Charge Pump

4

C1-

Negative Terminal of 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

DOUT2

RS-232 Transmitter Outputs

9

RIN2

RS-232 Receiver Inputs

10

ROUT2

TTL/CMOS Receiver Outputs

11, 14

NC

12

DIN2

TTL/CMOS Transmitter Inputs

13

DIN1

TTL/CMOS Transmitter Inputs

15

ROUT1

TTL/CMOS Receiver Outputs

16

RIN1

RS-232 Receiver Inputs

17

DOUT1

RS-232 Transmitter Outputs

18

GND

Ground

19

+3.0V to +5.5V Supply Voltage

20

PWRDOWN

Shutdown Control. Active low.



FUNCTION TABLE

For EACH DRIVER

INPUTS (DIN)

INPUTS( PWRDOWN )

OUTPUT DOUT

X

L

Z

L

H

H

H

H

L

For EACH RECEIVER

INPUTS(RIN)

INPUTS ( EN )

OUTPUT ROUT

L

L

H

H

L

L

X

H

Z

OPEN

L

H

H=High Level, L=Low Level, X=Irrelevant, Z=High Impedance (off),

OPEN=Input disconnected or connected driver off.