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MIC803-29D2VC3 Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC803-29D2VC3 Datasheet(HTML) 8 Page - Micrel Semiconductor |
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8 / 10 page  Micrel, Inc. MIC803 December 2010 8 M9999-122310-A Application Information Microprocessor Reset The /RESET pin is asserted whenever VCC falls below the Reset Threshold Voltage, VTH. The /RESET pin remains asserted for the duration of the Reset Timeout Period (tRESET) after VCC has risen above the Reset Threshold Voltage. The reset function ensures the microprocessor is properly reset and powers up in a known condition after a power failure. /RESET will remain valid with VCC as low as 1.0V. The /RESET output is a simple open-drain N-channel MOSFET structure. A pull-up resistor must be used to pull this output up to some voltage. For most applications, this voltage will be the same power supply that supplies VCC to the MIC803. As shown in Figure 1, it is possible, however, to tie this resistor to some other voltage. This will allow the MIC803 to monitor one voltage while level-shifting the /RESET output to some other voltage. The pull-up voltage must be limited to 5.5V. The resistor must be small enough to supply current to the inputs and leakage paths that are driven by the /RESET output. Figure 1. MIC803 used in a Multiple Supply System /RESET Valid at Low Voltage As VCC drops to 0V, the MIC803 will no longer be able to pull the /RESET output low, and the pull-up resistor will pull the output high. The value of the pull-up resistor and the voltage it is connected to will affect the point at which this happens. Figure 2. /RESET at falling VCC Wire OR’ing The /RESET Output Since the /RESET output is open-drain, several reset sources can be wire-ORed, in parallel, to allow resets from multiple sources. VCC Transients The MIC803 is relatively immune to negative-going VCC glitches below the Reset Threshold. See the Typical Characteristic Curve, Maximum Transient Duration vs Overdrive on page 6 of the datasheet. As shown in Figure 3, the Overdrive Voltage is the difference between the Threshold Voltage and the minimum point of the VCC glitch. Typically, an overdrive of 100mV, with duration of 15μs or less will not cause a reset. If additional transient immunity is needed, a 0.1μF bypass capacitor can be placed as close as possible to the MIC803 on the VCC pin. Figure 3. VCC Transient |
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