MIC8114 Просмотр технического описания (PDF) - Micrel

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MIC8114

Microprocessor Reset Circuits

Micrel 

MIC8114

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.

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 /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

VCC

MIC81 14

RESET

VCC

µP

100K

RESET

/RESET Valid to VCC = 0V

July 2005

5

MIC8114

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