DS1810R-10 查看數據表（PDF） - Micrel

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DS1810R-10

Microprocessor Reset Circuit

Micrel 

MIC1810 Microprocessor Reset Circuit

Circuit Description

Microprocessor Reset

The RESET pin is asserted whenever VCC falls below

the reset threshold voltage. The reset pin remains

8++

8JDH

8JDH

asserted for a period of 150ms after VCC has risen

J

J

above the reset threshold voltage. The reset function

ensures the microprocessor is properly reset and powers 4-5-6

up into a known condition after a power failure. RESET

will remain valid with VCC as low as 1.4V.

Figure 2. Reset Timing Diagram

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 50µs or less will not cause

an unwanted reset.

VCC

VCC

MIC1810

RESET

VCC

µP

RESET

100K

Figure 3. RESET Valid to VCC = OV

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 100KΩ 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.

5

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