Table 3. DB9 Cable Connections

Commonly Used for EIA/TIA-232E and

V.24 Asynchronous Interfaces

PIN

EIA/TIA-232E, V.28 SPECIFICATIONS

1

Received Line Signal

Detector (sometimes

called Carrier Detect, DCD)

Handshake from DCE

2

Receive Data (RD)

Data from DCE

3

Transmit Data (TD)

Data from DTE

4

Data Terminal Ready

Handshake from DTE

5

Signal Ground

Reference point for Signals

6

Data Set Ready (DSR)

Handshake from DCE

7

Request to Send (RTS)

Handshake from DTE

8

Clear to Send (CTS)

Handshake from DCE

9

Ring Indicator

Handshake from DCE

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Analog Devices │ 14

MAX202E–MAX213E,

MAX232E/MAX241E

±15kV ESD-Protected,

5V RS-232 Transceivers

TOP VIEW

1

4

5

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

11

10

12

9

3

GND

C1-

C2+

5kΩ

5kΩ

C2-

T1IN

T2IN

R2OUT

R1OUT

VCC

+5V TO +10V

VOLTAGE DOUBLER

+10V TO -10V

VOLTAGE INVERTER

16

2

6

14

7

13

8

16V

6.3V

16V

6.3V

C1+

RS-232

OUTPUTS

RS-232

INPUTS

-10V

+10V

V+

+5V INPUT

V-

T1OUT

R1IN

R2IN

T2OUT

T1

15

T2

R1

R2

PIN NUMBERS ON TYPICAL OPERATING CIRCUIT REFER TO DIP/SO/TSSOP PACKAGE, NOT LCC.

* 1.0µF CAPACITORS, MAX232E ONLY.

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

VCC

GND

T1OUT

R1IN

C2+

C1-

V+

C1+

MAX202E

MAX232E

R1OUT

T1IN

T2IN

R2OUT

R2IN

T2OUT

V-

C2-

DIP/SO/TSSOP

0.1µF

0.1µF

*

0.1µF

*

0.1µF

*

0.1µF

*

Pin Configurations and Typical Operating Circuits (continued)