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SP3245EER1-L Datasheet(PDF) 11 Page - Sipex Corporation

Part # SP3245EER1-L
Description  3.0V to 5.5V RS-232 Transceivers with Auto On-Line짰 Plus
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3245EER1-L Datasheet(HTML) 11 Page - Sipex Corporation

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11
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
© Copyright 2006 Sipex Corporation
DESCRIPTION
C
2
+
-
V
CC
C
3
C
4
C
1
+
+
+
e-
e-
Phases 1 and 3: Store/Double.
Double charge from C1 onto C2.
C2 is now charged to -2xVcc
+
C
2
+
-
V
CC
C
3
C
4
C
1
+
+
+
e-
+
e+
e+
C
2
+
-
V
CC
C
3
C
4
C
1
+
+
+
Phase 2 – Vss transfer from C2 to C4.
Meanwhile C1 is charged to Vcc
e-
e-
e-
+
Vss
transfer from C2 to C3.
Meanwhile C1 is charged to Vcc
V
DD
V-
V+
V-
V+
V+
Patented 5,306,954 (Sipex, inc.)
Phase 4 VDD
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
C1=0.047µF, C2-C4=0.33µF
3.0V to 5.5V
C1-C4=0.22µF
Charge Pump Capacitor Values


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