SP3244E Datasheet, PDF (11/22 Pages) Sipex Corporation – 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus

DESCRIPTION
+
V
CC
Phases 1 and 3: Store/Double.
-
Double charge from C1 onto C2.
C2 is now charged to -2xVcc
C
+
1
+
C
2
e-
e-
+
V+
C
3
V- ₊
C
4
+
V
CC
- _{Phase 2 – Vss transfer from C2 to C4.}
Meanwhile C1 is charged to Vcc
+
C
1
e-
+
C
+
V+
C
3
2
e-
e-
+
C
4
Vss
Patented 5,306,954 (Sipex, inc.)
C
+
1
e-
+
V
CC
-
Phase 4 VDD transfer from C2 to C3.
Meanwhile C1 is charged to Vcc
V
DD
e+
e+
+
+
C
2
V+
C
3
V- +
C
4
Charge Pump Phases
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP3244E_SP3245E_100_121509