7

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Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without

notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com

FN3020.7

July 28, 2005

-

+

RS-232

INPUTS AND

DTR (20) DATA TERMINAL

DSRS (24) DATA SIGNALING

DCD (8) DATA CARRIER

R1 (22) RING INDICATOR

SIGNAL GROUND (7)

15

8

13

7

14

2

-

4

R2

R1

T2

T1

9

12

10

11

3

1

ICL232

C1

1

µF

DTR

DSRS

DCD

R1

+5V

INPUTS

OUTPUTS

TTL/CMOS

-

+

-

+

TD (2) TRANSMIT DATA

RTS (4) REQUEST TO SEND

RD (3) RECEIVE DATA

CTS (5) CLEAR TO SEND

8

13

7

14

15

R2

R1

T2

T1

9

12

10

11

4

5

3

1

ICL232

C1

1

µF

C2

1

µF

TD

RTS

RD

CTS

INPUTS

OUTPUTS

TTL/CMOS

-

+

5

C2

1

µF

16

C3

2

6

2

6

V-

V+

-

C4

2

µF

OUTPUTS

RATE SELECT

READY

DETECT

FIGURE 11. COMBINING TWO ICL232s FOR 4 PAIRS OF RS-232 INPUTS AND OUTPUTS

µF

ICL232