LC
-
32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
7 – 16
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
