SP3243E EXAR [Exar Corporation], SP3243E Datasheet - Page 14

• Manufacturer Part Number: SP3243E
• Description: 3 Driver/5 Receiver Intelligent +3.0V to +5.5V RS-232 Transceivers
• Manufacturer: EXAR [Exar Corporation]

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
-2
-4
-6
6
4
2
0
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
Load Current Per Transmitter [mA]
To µP Supervisor
C2
C1
C5
DB-9 Connector Pins:
1. Received Line Signal Detector
2. Received Data
3. Transmitted Data
4. Data Terminal Ready
5. Signal Ground (Common)
Circuit
+
+
+
0.1 µF
0.1 µF
0.1 µF
V
CC
16
28
24
14
13
12
20
19
18
17
15
22
23
21
1
2
C1+
C1-
C2+
C2-
R
T
T
R
R
T
R
R
SHUTDOWN
ONLINE
STATUS
R
1
2
3
1
2
2
3
4
IN
IN
IN
OUT
5
OUT
OUT
OUT
OUT
OUT
SP3243E
V
V
GND
CC
CC
26
Vout+
Vout-
25
5k Ω
5k Ω
5k Ω
5k Ω
5k Ω
T
T
T
1
2
3
R
R
R
R
R
6. DCE Ready
7. Request to Send
8. Clear to Send
9. Ring Indicator
OUT
OUT
OUT
5
V+
1
2
3
4
V-
IN
IN
IN
IN
IN
10
11
4
5
7
8
27
3
9
6
14
C3
C4
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.
+
+
0.1 µF
0.1 µF
0
0
1
8
9
6
7
Connector
DB-9
1
2
3
4
5
V
V
SP3243E_100_072309
OUT
OUT
-
+