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MIC812TU Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC812TU Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 7 page MIC811/812 Micrel MIC811/812 6 September 2005 Applications Information Microprocessor Reset The /RESET (or RESET) pin is asserted whenever VCC falls below the reset threshold voltage. The /RESET pin remains asserted for a period of 140ms after VCC has risen above the reset threshold voltage. The reset function ensures that 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 1V. VCC Transients The MIC811/812 are relatively immune to negative-going VCC glitches below the reset threshold.Typically, a negative-going transient 125mV below the reset threshold with a duration of 20µs or less will not cause a reset. Interfacing to Bidirectional Reset Pins The MIC811/812 can interface with µPs with bidirectional reset pins by connecting a 4.7kΩ resistor in series with the MIC811/812 output and the µP reset pin. /RESET Valid at Low Voltage A resistor can be added from the /RESET pin to ground to ensure the /RESET output remains low with VCC down to 0V. A 100kΩ resistor connected from the /RESET to ground is recommended. The size of the resistor should be large enough not to load the output excessively and small enough to pull-down any stray leakage currents. VCC RESET µP RESET VCC MIC811 VCC 100K Reset Valid to VCC = 0V |
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