SP3220B Datasheet, PDF (13/18 Pages) Sipex Corporation – High Speed +3.0V to +5.5V RS-232 Driver/Receiver Pair

V_CC = +5V
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 15. Charge Pump — Phase 1
V_CC = +5V
+
C_{1 –}
+
C_{2 –}
–10V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 16. Charge Pump — Phase 2
[
T
]
+6V
a) C2+
GND 1
T
GND ²
b) C2-
T
-6V
Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 5.48V
Figure 17. Charge Pump Waveforms
V_CC = +5V
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 18. Charge Pump — Phase 3
V_CC = +5V
+
C_{1 –}
+10V
+
C_{2 –}
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 19. Charge Pump — Phase 4
Rev. 7/8/03
SP3220B/U +3.0 to +5.0V RS-232 Transceivers
13
© Copyright 2003 Sipex Corporation