3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

6

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—

FUNCTION

—

MAX3222

Noninverting Complementary Receiver Outputs.

Always active.

DIP/SO

SSOP

—

11, 14

1

1

Receiver Enable. Active low.

2

2

Positive Terminal of Voltage-Doubler Charge-Pump

Capacitor

6

6

Negative Terminal of Inverting Charge-Pump

Capacitor

5

5

Positive Terminal of Inverting Charge-Pump

Capacitor

4

4

Negative Terminal of Voltage-Doubler Charge-Pump

Capacitor

3

3

+5.5V Generated by the Charge Pump

11, 12

12, 13

TTL/CMOS Transmitter Inputs

10, 13

10, 15

TTL/CMOS Receiver Outputs

9, 14

9, 16

RS-232 Receiver Inputs

8, 15

8, 17

RS-232 Transmitter Outputs

7

7

-5.5V Generated by the Charge Pump

18

20

Shutdown Control. Active low.

17

19

+3.0V to +5.5V Supply Voltage

16

18

Ground

No Connection

MAX3237

MAX3232

—

16

—

13

1

28

5

3

4

1

3

25

2

27

10, 11

17, 19, 22,

23, 24

9, 12

18, 20, 21

8, 13

8, 9, 11

7, 14

5, 6, 7,

10, 12

6

4

—

14

16

26

15

2

—

—

NAME

EN

C1+

C2-

C2+

C1-

V+

T_IN

R_OUT

R_IN

T_OUT

V-

SHDN

GND

R_OUTB

N.C.

MAX3241

20, 21

23

28

2

1

24

27

12, 13, 14

15–19

4–8

9, 10, 11

3

22

26

25

—

PIN

—

—

MegaBaud Control Input. Connect to GND for normal

—

15

MBAUD

—

______________________________________________________________Pin Description