SP3220EBEA-L-TR Datasheet, PDF (13/20 Pages) Exar Corporation – 3.0V to +5.5V RS-232 Driver/Receiver Pair

V_CC = +5V
DESCRIPTION
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
Figure 15. Charge Pump — Phase 1
V_CC = +5V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
+
C_{1 –}
+
C_{2 –}
-5.5V
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 –}
+5.5V
+
C_{2 –}
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 19. Charge Pump — Phase 4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP3220E_EB_EU_102_102016