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NE56631-30D Datasheet(PDF) 8 Page - NXP Semiconductors |
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NE56631-30D Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 11 page Philips Semiconductors Product data NE56631-XX Active-LOW system reset 2003 Feb 14 8 APPLICATION INFORMATION RESET VCC SUPPLY GND VCC NE56631-XX VSS VOUT RPU CPU SL01741 Figure 11. Conventional reset application for NE56631-XX. RESET VCC SUPPLY GND VCC NE56631-XX VSS VOUT RPU CPU SL01742 R D Figure 12. Power On Reset circuit for NE56631-XX. The Power ON Reset Circuit shown in Figure 12 is an example of obtaining a stable reset condition upon power-up. If power supply rises abruptly, the RESET may go “HIGH” momentarily when VCC is below the minimum operating voltage (0.85 V). To overcome this undesirable response, a resistor in placed between positive supply, VCC and VCC pin and a capacitor from VCC pin to ground. The RC circuit solution works reasonably well for power-up as long as the power supply voltage rises faster than the RC time constant. The RC network provides the necessary reset delay to hold the microprocessor in reset until its circuitry settles down and normal operation begins. When the supply turns off, the diode provides a path for the capacitor to discharge to more quickly assert logic LOW reset. |
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