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MIC1810 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part No. MIC1810
Description  Microprocessor Reset Circuit
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC1810 Datasheet(HTML) 5 Page - Micrel Semiconductor

   
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5
Microprocessor Reset
The RESET pin is asserted whenever VCC falls below
the reset threshold voltage. The reset pin remains
asserted for a period of 150ms after VCC has risen
above the reset threshold 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 1.4V.
VCC Transients
The MIC1810 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 50
µs or less will not cause
an unwanted reset.
RESET Valid to 0V
A resistor can be added from the RESET pin to ground
to ensure the RESET output remains low with VCC
down to 0V. A 100K
Ω resistor connected from RESET
to ground is recommended. The size of the resistor
should be large enough to not load the RESET output
and small enough to pull-down any stray leakage
currents.
Circuit Description
Figure 2. Reset Timing Diagram
Figure 3. RESET Valid to VCC = OV
8++
8JDH
4-5-6
J
J
8JDH
VCC
RESET
µP
RESET
VCC
MIC1810
VCC
100K
MIC1810 Microprocessor Reset Circuit


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