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SP3245EEY-L Datasheet(PDF) 11 Page - Sipex Corporation |
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SP3245EEY-L Datasheet(HTML) 11 Page - Sipex Corporation |
11 / 22 page 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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