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SA56606-43GW Datasheet(PDF) 9 Page - NXP Semiconductors |
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SA56606-43GW Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 12 page Philips Semiconductors Product data SA56606-XX CMOS system reset 2001 Jun 19 9 Application information SL01371 SA56606-XX VDD SUPPLY GND VDD VSS VOUT RESET CPU RPU Figure 14. Conventional reset application. The Power ON Reset Circuit shown in Figure 15 is an example of how to obtain a stable reset condition upon power-up. If the power supply voltage rises abruptly, the RESET may go HIGH momentarily when VDD is below the minimum operating voltage (0.95 V). To overcome this, a resistor (R) is placed between positive supply and the VDD pin with a capacitor from the VDD pin to ground. SL01372 SA56606-XX VDD SUPPLY GND VDD VSS VOUT RESET CPU RPU D C R Figure 15. Power ON reset circuit. SL01373 SA56606-XX OUTPUT R12 R11 VSUPPLY A VDD VSS CURRENT CHANGES RPU Figure 16. High impedance supply operating problems. Significant voltage variations of VDD may occur when the device is operated from high impedance power sources. When the device asserts or releases a reset, VDD variations are produced as a result of the voltage drop developed across R11 due to the current variations through the resistor R11 (representing the supply impedance). If the VDD variations are large, such that they exceed the Detection Hysteresis, the output of the device can oscillate from a HIGH state to a LOW state. The user should avoid using high impedance VDD sources to prevent such situations. |
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