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

Transceivers Using Four 0.1µF External Capacitors

12

______________________________________________________________________________________

__________________________________________________Typical Operating Circuits

MAX3222

R2OUT

10

1

R1OUT

13

R2IN

9

18

GND

16

RS-232

OUTPUTS

TTL/CMOS

INPUTS

T2IN

11

T1IN

12

C2-

6

C2+

5

C1-

4

C1+

2

R1IN 14

T2OUT 8

T1OUT 15

V-

7

V+

3

17

C1

0.1

µF

C2

0.1

µF

0.1

µF

+3.3V

RS-232

INPUTS

TTL/CMOS

OUTPUTS

5k

5k

EN

SHDN

C3

*

0.1

µF

C4

0.1

µF

PIN NUMBERS REFER TO DIP/SO PACKAGES.

MAX3232

R2OUT

9

R1OUT

12

R2IN

8

GND

15

RS-232

OUTPUTS

TTL/CMOS

INPUTS

T2IN

10

T1IN

11

C2-

5

C2+

4

C1-

3

C1+

1

R1IN 13

T2OUT 7

T1OUT 14

V-

6

V+

2

C4

0.1

µF

16

0.1

µF

0.1

µF

0.1

µF

+3.3V

RS-232

INPUTS

TTL/CMOS

OUTPUTS

C3

*

0.1

µF

5k

5k

SEE TABLE 2 FOR CAPACITOR SELECTION

Interconnection with 3V and 5V Logic

The MAX3222/MAX3232/MAX3237/MAX3241 can

directly interface with various 5V logic families, includ-

ing ACT and HCT CMOS. See Table 3 for more informa-

tion on possible combinations of interconnections.

Table 3. Logic-Family Compatibility

with Various Supply Voltages

Compatible with ACT and

HCT CMOS, and with TTL.

Incompatible with AC, HC,

and CD4000 CMOS.

3.3

5

SYSTEM

POWER-

SUPPLY

VOLTAGE

(V)

Compatible with all TTL

and CMOS-logic families.

5

5

Compatible with all CMOS

families.

3.3

3.3

COMPATIBILITY

MAX32_ _

SUPPLY

VOLTAGE

(V)