14

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3243E_100_072309

Figure 19. SP3243E Driver Output Voltages vs. Load

Current per Transmitter

Figure 20. Circuit for the connectivity of the SP3243E with a DB-9 connector

6

4

2

0

-2

-4

-6

Load Current Per Transmitter [mA]

Vout+

Vout-

The SP3243E driver outputs are able to maintain

voltage under loading of up to 2.5mA per driver,

ensuring sufficient output for mouse-driving ap-

plications.

6

7

8

9

1

2

3

4

5

DB-9

Connector

6. DCE Ready

7. Request to Send

8. Clear to Send

9. Ring Indicator

DB-9 Connector Pins:

1. Received Line Signal Detector

2. Received Data

3. Transmitted Data

4. Data Terminal Ready

5. Signal Ground (Common)

SP3243E

28

24

2

1

27

3

26

5k Ω

5k Ω

5k Ω

5k Ω

5k Ω

GND

C1+

C1-

C2+

C2-

V+

V-

14

13

12

20

19

18

17

16

15

0.1 µF

0.1 µF

0.1 µF

+

C2

C5

C1

+

+

C3

C4

+

+

0.1 µF

0.1 µF

9

10

11

4

5

6

7

8

To µP Supervisor

Circuit

23

22

21

25

ONLINE

SHUTDOWN

STATUS

0

+

1

0