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SP3223U Datasheet, PDF (14/24 Pages) Sipex Corporation – High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
Figure 21. Charge Pump — Phase 1
VCC = +5V
+
C1 –
Figure 22. Charge Pump — Phase 2
+
C2 –
–10V
[
T
a) C2+
1
T
2
2
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
]
+6V
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
Date: 5/25/04
SP3223U/3243U +3.0V to +5.5V RS-232 Transceivers
14
© Copyright 2004 Sipex Corporation