Datasheet

MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
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Pin Description
PIN NAME FUNCTION
1 C1+ Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
2 V+ +4.2V Supply Generated by the Charge Pump
3 C1- Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor
4 C2+ Positive Terminal of the Inverting Charge-Pump Capacitor
5 C2- Negative Terminal of the Inverting Charge-Pump Capacitor
6 V- -4.2V Supply Generated by the Charge Pump
7, 8, 9
T1IN,
T2IN, T3IN
CMOS Transmitter Inputs
10 LOUT Handshaking Output. This output is active during shutdown for the MAX3389E.
11 SWOUT Switch Output
12, 13
R2OUT,
R1OUT
CMOS Receiver Outputs. Swing between 0 and V
L
.
14 V
L
Logic-Level Supply. All CMOS inputs and outputs are referred to this supply. V
L
= +1.8V to +3.0V.
15 SWIN Switch Input.
16 LIN Handshaking Input. This input is active during shutdown for the MAX3389E.
17, 18
R2IN,
R1IN
RS-232 Receiver Inputs
19, 20, 21
T3OUT,
T2OUT,
T1OUT
RS-232 Transmitter Outputs
22 GND Ground
23 V
CC
+2.35V to +3V Supply Voltage
24 SHDN Shutdown Input. 0 = shutdown, switch open; 1 = normal operation, switch closed.