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
Minimum Recommended Charge Pump Capacitor Values
Input Voltage VCC
Charge Pump Capacitor Value for SP32XX
3.0V to 3.6V
C1-C4=0.1µF
4.5V to 5.5V
3.0V to 5.5V
C1=0.047µF, C2-C4=0.33µF
C1-C4=0.22µF
Charge Pump Capacitor Values
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^® Plus
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