V
= +5V
CC
C
+5V
4
+
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
–
C
C
2
1
–
SS
C
–5V
–5V
3
Figure 13. Charge Pump — Phase 1
V
= +5V
CC
C
4
+
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
C
C
2
1
–
–
SS
C
–10V
3
Figure 14. Charge Pump — Phase 2
[
T
]
+6V
a) C2+
T
T
GND
1
2
GND
b) C2-
-6V
Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 5.48V
Figure 15. Charge Pump Waveforms
V
= +5V
CC
C
+5V
4
+
–
+
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
–
C
C
2
1
–
V
SS
C
–5V
–5V
3
Figure 16. Charge Pump — Phase 3
V
= +5V
CC
C
+
+10V
+
4
–
V
V
Storage Capacitor
Storage Capacitor
DD
+
C
C
2
–
1
–
+
3
–
SS
C
Figure 17. Charge Pump — Phase 4
Rev. A Date:12/11/03
SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers
© Copyright 2003 Sipex Corporation
12
SIPEX [ SIPEX CORPORATION ]
