±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

______________________________________________________________ Pin Description

PIN

MAX3224E

MAX3225E

MAX3226E

MAX3227E

TQFN

DIP/

SSOP/

TSSOP

TQFN

SSOP/

TSSOP

MAX3244E

MAX3245E

SO/ SSOP/ TSSOP

MAX3245E

TQFN

NAME

FUNCTION

19

1

14

1

—

—

READY

Ready to Transmit Output,

active-high. READY is

enabled high when V- goes

below -4V and the device is

ready to transmit.

1

2

16

2

28

31

C1+

Positive Terminal of Voltage-

Doubler Charge-Pump

Capacitor

20

3

15

3

27

30

V+

+5.5V generated by the

charge pump

2

4

1

4

24

26

C1-

Negative Terminal of Voltage-

Doubler Charge-Pump

Capacitor

3

5

2

5

1

33

C2+

Positive Terminal of Inverting

Charge-Pump Capacitor

4

6

3

6

2

34

C2-

Negative Terminal of

Inverting Charge-Pump

Capacitor

5

7

4

7

3

35

V-

-5.5V Generated by the

Charge Pump

6, 15

8, 17

10

13

9, 10, 11

7, 8, 9

T_OUT

RS-232 Transmitter Outputs

7, 14

9, 16

5

8

4-8

1-5

R_IN

RS-232 Receiver Inputs

8, 13

10, 15

6

9

15-19

15, 16, 17,

19, 20

R_OUT

TTL/CMOS Receiver Outputs

9

11

7

10

21

23

INVALID

Valid Signal Detector Output,

active low. A logic high

indicates that a valid RS-232

level is present on a receiver

input.

10, 11

12, 13

8

11

12-14

11, 12, 13

T_IN

TTL/CMOS Transmitter Inputs

Maxim Integrated

7

MAX3224E/MAX3225E/

MAX3226E/MAX3227E/MAX3244E/MAX3245E