V
CC
C5
C1
+
+
0.1µ F
28 C1+
0.1µ F
24 C1-
1 C2+
0.1µ F
2 C2-
14
T
1
IN
TTL/CMOS
INPUTS
13
T
2
IN
12
T
3
IN
20
R
2
OUT
19
R
1
OUT
18
R
2
OUT
TTL/CMOS
OUTPUTS
17
R
3
OUT
16
R
4
OUT
15
R
5
OUT
V
CC
26
V
CC
V+
27
C3
3
C4
+
0.1µ F
C2
+
SP3243E
V-
+
0.1µ F
T
1
OUT
9
RS-232
OUTPUTS
T
2
OUT
10
T
3
OUT
11
R
1
IN
4
5
6
7
8
RS-232
INPUTS
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
R
2
IN
R
3
IN
R
4
IN
R
5
IN
22
23
SHUTDOWN
ONLINE
To µ P Supervisor
Circuit
21
STATUS
GND
25
Figure 8. SP3243E Typical Operating Circuit
32
31
30
29
28
27
26
NC
R
1
IN
R
2
IN
R
3
IN
R
4
IN
R
5
IN
T
1
OUT
T
2
OUT
25
V-
C2-
NC
C2+
C1+
NC
V+
V
CC
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
SP3243E
NC
GND
C1-
ONLINE
SHUTDOWN
STATUS
R
2
OUT
R
1
OUT
10
11
12
13
14
15
Figure 9. SP3243E QFN Pinout Configuration
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
T
3
OUT
T
3
IN
T
2
IN
T
1
IN
R
5
OUT
R
4
OUT
R
3
OUT
R
2
OUT
16
9
SP3243E_100_072309
7
EXAR [ EXAR CORPORATION ]
