MIC809J(2014) 데이터 시트보기 (PDF) - Micrel
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MIC809J Datasheet PDF : 10 Pages
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Micrel, Inc.
Application 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
The MIC809/810 are relatively immune to negative-going
VCC glitches below the reset threshold. Typically, a
negative-going transient 125mV below the reset
threshold with duration of 2µs 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 (Figure 1).
Figure 1. Reset Valid to VCC = 0V
July 6, 2015
7
MIC809/810
Revision 3.0
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