MIC811JU 데이터 시트보기 (PDF) - Micrel

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MIC811JU

Micro-Power Comparator/ Battery Monitor

Micrel 

MIC811/812

Applications 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 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.

VCC Transients

The MIC811/812 are 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

20µs or less will not cause a reset.

Interfacing to Bidirectional Reset Pins

The MIC811/812 can interface with µPs with bidirectional

reset pins by connecting a 4.7kΩ resistor in series with the

MIC811/812 output and the µP reset pin.

Micrel

/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 size of the resistor should be large

enough not to load the output excessively and small enough

to pull-down any stray leakage currents.

VCC

VCC

MIC81 1

RESET

VCC

µP

100K

RESET

Reset Valid to VCC = 0V

MIC811/812

6

September 2005

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