SP3223EB Datasheet, PDF (14/25 Pages) Sipex Corporation – Intelligent +3.0V to +5.5V RS-232 Transceivers

V_CC = +5V
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 21. Charge Pump — Phase 1
V_CC = +5V
+
C_{1 –}
Figure 22. Charge Pump — Phase 2
a) C2+
1
2
2
+
C_{2 –}
–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
V_CC = +5V
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 24. Charge Pump — Phase 3
V_CC = +5V
+
C_{1 –}
+10V
+
C_{2 –}
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 25. Charge Pump — Phase 4
Date: 6/2/04
SP3223EB/3243EB +3.0V to +5.5V RS-232 Transceivers
14
© Copyright 2004 Sipex Corporation