MAX3222

3V TO 5.5V MULTICHANNEL RS232 LINE DRIVER/RECEIVER

WITH ±15kV ESD PROTECTION

SLLS408G − JANUARY 2000 − REVISED MARCH 2004

8

POST OFFICE BOX 655303

APPLICATION INFORMATION

15

14

8

1

2

3

4

7

DIN1

PWRDOWN

NC

13

DOUT1

20

17

16

19

18

ROUT1

5

6

+

−

C3†

VCC

C2+

C1

C2

C1+

GND

V−

C1−

RIN1

C2−

+

−

CBYPASS

= 0.1

µF

V+

+

−

+

−

DOUT2

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

0.47

µF

0.33

µF

0.1

µF

VCC vs CAPACITOR VALUES

EN

C4

+

−

9

10

Powerdown

12

11

DIN2

NC

RIN2

ROUT2

† C3 can be connected to VCC or GND.

NOTES: A. Resistor values shown are nominal.

B. NC − No internal connection

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

connected as shown.

Figure 5. Typical Operating Circuit and Capacitor Values