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MIC8114 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part No. MIC8114
Description  Microprocessor Reset Circuit
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC8114 Datasheet(HTML) 5 Page - Micrel Semiconductor

   
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July 2005
5
MIC8114
MIC8114
Micrel
Applications Information
Microprocessor Reset
The /RESET pin is asserted whenever VCC falls below the
reset threshold voltage. The reset pin remains asserted for a
period of 790ms after VCC has risen above the reset thresh-
old voltage. The reset function ensures the microprocessor
is properly reset and powers up into a known condition after
a power failure. /RESET will remain valid with VCC as low
as 1V.
VCC Transients
The MIC8114 is relatively immune to the 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.
/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 /RESET-to-ground is
recommended. The resistor should be large enough not to
load the /RESET output and small enough to pull-down any
stray leakage currents
VCC
RESET
µP
RESET
VCC
MIC8114
VCC
100K
/RESET Valid to VCC = 0V


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