LC-19D1EWH (serv.man6). Major IC Informations - Sharp TV Service Manual (repair manual). Page 10

LC-19D1E/S-BK/WH

5 – 10

RS232C-DRIVER/RECEIVER

1

EN

I

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

R_IN

I

RS-232 Receiver Inputs

9

R_OUT

O

TTL/CMOS Receiver Outputs

10

INVALID

I

Output of the Valid Signal Detector. INVALID is enabled high if a valid RS-232 level is present on any receiver 
input.

11

T_IN

I

TTL/CMOS Transmitter Inputs

12

FORCEON

I

Drive high to override automatic circuitry keeping transmitters and charge pump on (FORCEOFF must be high)

13

T_OUT

O

RS-232 Transmitter Outputs

14

GND

 -

Ground

15

VCC

 -

 +3.0V to +5.5V Supply Voltage

16

FORCEOFF

I

Force-Off Input, active low. Drive low to shut down transmitters, receivers (MAX3243E, except R2OUTB), and 
on-board charge pump . This overrides all automatic circuitry and FORCE ON