2.5V, ±15kV ESD-Protected RS-232

Transceivers for PDAs and Cell Phones

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5

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

14

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

+2.35V to +3V Supply Voltage

24

SHDN

Shutdown Input. 0 = shutdown, switch open; 1 = normal operation, switch closed.