MIC811 datasheet(7/16 Pages) MICROCHIP

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DS20006526A-page 7

MIC811/MIC812

3.0

APPLICATION INFORMATION

3.1

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 140 ms after VCC has

risen above the reset threshold voltage. The reset

function ensures that 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.

3.2

VCC Transients

The

MIC811/812

are

relatively

immune

negative-going VCC glitches below the reset threshold.

Typically, a negative-going transient 125 mV below the

reset threshold with a duration of 20 μs or less will not

cause a reset.

3.3

Interfacing to Bidirectional Reset

Pins

The MIC811/812 can interface with microprocessors

with bidirectional reset pins by connecting a 4.7 kΩ

resistor in series with the MIC811/812 output and the

microprocessor reset pin.

3.4

/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 100 kΩ resistor connected from the

/RESET to ground is recommended. The value of the

resistor should be large enough not to load the output

excessively and small enough to pull-down any stray

leakage currents.

FIGURE 3-1:

Reset Valid to VCC = 0V.

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