LC-46LE700E (serv.man9). Major IC Informations - Sharp TV Service Manual (repair manual). Page 16

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LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
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2.11. IC506 (VHiM3221EiP-1Y)
2.11.1 Block Diagram
2.11.2 Pin Connections and short description
Pin No.
Pin Name
I/O
Pin Function
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
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