Datasheet

MAX3233E/MAX3235E
_______________________________________________________________________________________ 5
______________________________________________________________Pin Description
TTL/CMOS Receiver Outputs
FUNCTIONPIN NAME
1
3
7
8
9
10
11, 12
14
15
R2OUT
16
17
18
Invalid Signal Detector Output, active low. A logic high indicates that a valid RS-232
level is present on a receiver.
T2IN
TTL/CMOS Transmitter Outputs
2
INVALID
5
T1OUT
RS-232 Transmitter Outputs
FORCEON
Force-On Input, active high. Drive high to override AutoShutdown Plus, keeping
transmitters and receivers active (FORCEOFF must be high) (Table 1).
13
R1IN
RS-232 Receiver Outputs
C1+
Positive terminal of the internal voltage-doubling charge-pump capacitor. Leave
unconnected or connect to an external 0.1µF capacitor. See Charge Pump Section.
V
CC
Supply Voltage (MAX3233E = +3.3V, MAX3235E = +5.0V)
FORCEOFF
Force-Off Input, active low. Drive low to shut down transmitters, receivers, and charge
pump. This overrides AutoShutdown Plus and FORCEON (Table 1).
V+ +5.5V generated by the charge pump. Do not connect.
C1-
Negative terminal of the internal voltage-doubling charge-pump capacitor. Leave
unconnected or connect to an external 0.1µF capacitor. See Charge Pump Section.
C2+ Positive terminal of the internal inverting charge-pump capacitor. Do not connect.
C2- Negative terminal of the internal inverting charge-pump capacitor. Do not connect.
V- -5.5V generated by the charge pump. Do not connect.
GND Ground
±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors
6 R1OUT
4 T1IN
19 T2OUT
20 R2IN