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SP3220EUEY-L-TR Datasheet, PDF (13/20 Pages) Exar Corporation – 3.0V to +5.5V RS-232 Driver/Receiver Pair | |||
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VCC = +5V
DESCRIPTION
+
C1 â
â5V
+5V
+
C2 â
â5V
Figure 15. Charge Pump â Phase 1
VCC = +5V
C4
+ â VDD Storage Capacitor
â + VSS Storage Capacitor
C3
+
C1 â
+
C2 â
-5.5V
C4
+ â VDD Storage Capacitor
â + VSS Storage Capacitor
C3
Figure 16. Charge Pump â 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
VCC = +5V
+
C1 â
â5V
+5V
+
C2 â
â5V
C4
+ â VDD Storage Capacitor
â + VSS Storage Capacitor
C3
Figure 18. Charge Pump â Phase 3
VCC = +5V
+
C1 â
+5.5V
+
C2 â
C4
+ â VDD Storage Capacitor
â + VSS Storage Capacitor
C3
Figure 19. Charge Pump â Phase 4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 ⢠510-668-7017 ⢠www.exar.com
13
SP3220E_EB_EU_102_102016
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