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SP233ECP Datasheet(PDF) 7 Page - Sipex Corporation |
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SP233ECP Datasheet(HTML) 7 Page - Sipex Corporation |
7 / 15 page Rev. 06/20/02 SP202E Series High Performance RS232 Transceivers © Copyright 2002 Sipex Corporation 7 Figure 6. Charge Pump Waveforms +10V a) C 2 + GND GND b) C 2 – –10V Figure 7. Charge Pump — Phase 3 VCC = +5V –5V +5V –5V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – Figure 8. Charge Pump — Phase 4 VCC = +5V +10V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – be symmetrical. Older charge pump approaches that generate V– from V+ will show a decrease in the magnitude of V– compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at 15kHz. The external capacitors can be as low as 0.1 µF with a 16V breakdown voltage rating. Shutdown (SD) and Enable (EN) for the SP310E and SP312E Both the SP310E and SP312E have a shutdown/ standby mode to conserve power in battery-pow- ered systems. To activate the shutdown mode, which stops the operation of the charge pump, a logic “0” is applied to the appropriate control line. For the SP310E, this control line is ON/OFF (pin 18). Activating the shutdown mode also puts the |
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