MAX3387 Maxim, MAX3387 Datasheet - Page 6

• Manufacturer Part Number: MAX3387
• Description: 3V / 15kV ESD-Protected / AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
• Manufacturer: Maxim

3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
6
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PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
FORCEOFF
FORCEON
INVALID
R3OUT
R2OUT
R1OUT
T3OUT
T2OUT
T1OUT
NAME
T1IN
T2IN
T3IN
R3IN
R2IN
R1IN
GND
C1+
C2+
V
C1-
C2-
V+
V
V-
CC
L
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
+5.5V Supply Generated by the Charge Pump
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of the Inverting Charge-Pump Capacitor
Negative Terminal of the Inverting Charge-Pump Capacitor
-5.5V Generated by the Charge Pump
TTL/CMOS Transmitter Inputs
Output of the Valid Signal Detector. INVALID is high if a valid RS-232 signal is present on
the receiver inputs.
TTL/CMOS Transmitter Inputs
Force-On Input. Drive high to override automatic circuitry keeping transmitters on
(FORCEOFF must be high) (Table 1).
TTL/CMOS Receiver Outputs. Swing between 0 and V
Logic-Level Supply. All CMOS inputs and outputs are referenced to this supply.
RS-232 Receiver Inputs
RS-232 Transmitter Outputs
Ground
+3.0V to +5.5V Supply Voltage
Force-Off Input. Drive low to shut down transmitters and on-board power supply. This over-
rides all automatic circuitry and FORCEON (Table 1).
FUNCTION
L
.
Pin Descriptions