MAX3221

3V TO 5.5V SINGLECHANNEL RS232 LINE DRIVER/RECEIVER

WITH ±15kV ESD PROTECTION

SLLS348M − JUNE 1999 − REVISED MARCH 2004

10

POST OFFICE BOX 655303

APPLICATION INFORMATION

CBYPASS = 0.1 µF

Auto-

powerdown

VCC

C1

C2, C3, and C4

3.3 V

± 0.3 V

5 V

± 0.5 V

3 V to 5.5 V

0.1

µF

0.047

µF

0.1

µF

0.1

µF

0.33

µF

0.47

µF

VCC vs CAPACITOR VALUES

FORCEOFF

+

−

+

−

+

−

+

−

+

−

1

8

2

3

5

6

7

4

16

13

12

11

10

9

15

14

VCC

GND

C1+

V+

C2+

C1−

C2−

V−

DOUT

FORCEON

DIN

INVALID

ROUT

EN

RIN

C1

C2

C4

5 k

Ω

C3†

† C3 can be connected to VCC or GND.

NOTES: A. Resistor values shown are nominal.

B. Nonpolarized ceramic capacitors are acceptable. If polarized tantalum or electrolytic capacitors are used, they should be

connected as shown.

Figure 6. Typical Operating Circuit and Capacitor Values