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MIC809JU Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC809JU Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 6 page April 2005 5 M0450-041405 MIC809/810 Micrel 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 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 1.4V (1V for SC-70 package). VCC Transients TheMIC809/810arerelativelyimmunetonegative-goingVCC glitches below the reset threshold.Typically, a negative-going transient 125mV below the reset threshold with a duration of 20µs or less (SC70 package) will not cause a reset. Interfacing to Bidirectional Reset Pins The MIC809/810 can interface with µPs with bidirectional reset pins by connecting a 4.7kΩ resistor in series with the MIC809/810 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 resistor should be small enough to pull-down any stray leakage currents and large enough not to load the reset output. See Figure below. VCC RESET µP RESET VCC MIC809 VCC 100K Reset Valid to VCC = 0V |
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