V
= +5V
CC
C
+5V
4
+
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
–
C
C
2
1
–
SS
C
–5V
–5V
3
Figure 21. Charge Pump — Phase 1
V
= +5V
CC
C
4
+
–
3
V
Storage Capacitor
Storage Capacitor
DD
+
+
C
C
2
1
–
–
+
–
V
SS
C
–10V
Figure 22. Charge Pump — Phase 2
[
T
]
+6V
a) C2+
T
T
0V
0V
1
2
2
b) C -
2
-6V
Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 1.96V
Figure 23. Charge Pump Waveforms
V
= +5V
CC
C
+
+5V
4
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
SS
+
–
+
–
C
C
2
1
–
C
–5V
–5V
3
Figure 24. Charge Pump — Phase 3
V
= +5V
CC
C
+
+10V
4
–
+
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
–
C
C
2
1
–
V
SS
C
3
Figure 25. Charge Pump — Phase 4
Date: 6/2/04
SP3223EB/3243EB +3.0V to +5.5V RS-232 Transceivers
© Copyright 2004 Sipex Corporation
14
SIPEX [ SIPEX CORPORATION ]
