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SP3223B Datasheet, PDF (14/24 Pages) Sipex Corporation – Intelligent +3.0V to +5.5V RS-232 Transceivers
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
Figure 21. Charge Pump — Phase 1
VCC = +5V
+
C1 –
Figure 22. Charge Pump — Phase 2
a) C2+
1
2
2
+
C2 –
–10V
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
[
T
]
+6V
T
0V
0V
b) C2-
T
-6V
Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 1.96V
Figure 23. Charge Pump Waveforms
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
Figure 24. Charge Pump — Phase 3
VCC = +5V
+
C1 –
+10V
+
C2 –
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
Figure 25. Charge Pump — Phase 4
Rev. 6/30/03
SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers
14
© Copyright 2003 Sipex Corporation