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MIC6315-40D4U Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC6315-40D4U Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 6 page September 2008 5 M9999-091608 MIC6315 Micrel Applications Information Microprocessor Reset The /RESET pin is asserted whenever VCC falls below the reset threshold voltage or if /MR (manual reset) is forced low. The /RESET pin remains asserted for the duration of the reset timeout period after VCC has risen above the reset threshold or /MR has returned high. The reset function en- sure 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. The /RESET output is a simple open-drain N-channel MOS- FETstructure.Apull-upresistormustbeusedtopullthis output up to some voltage. For most applications, this volt- age will be the same power supply that supplies VCC to the MIC6315. It is possible, however, to tie this resistor to some other voltage. This will allow the MIC6315 to monitor one voltage while level-shifting the /RESET output to some other voltage. The pull-up voltage must be limited to 6.0V or less (absolute maximum) to avoid damage to the MIC6315. The resistor must be small enough to supply current to the inputs and leakage paths that are driven by the /RESET output. /RESET Valid at Low Voltage AsVCC drops to 0V, the MIC6315 will no longer be able to pullthe/RESEToutputlow.Atthispoint,thepull-upresistor 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. Wire OR'ing The /RESET Output Because the RESET output is open-drain, several reset sources can be wire-ORed, in parallel, to allow resets from multiple sources. VCC Transients The MIC6315 is 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 20µsorlesswillnotcauseanunwantedreset.Ifadditional transient immunity is needed, a bypass capacitor can be placed a close as possible to the MIC6315. VCC RESET 5V SYSTEM RESET VCC MIC6315 +5.0V MR 10k +3.3V MIC6315 Used in a Multiple Supply System |
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