MIC810RYC3 datasheet(7/10 Pages) MICREL

7 / 10 page

Micrel, Inc.

MIC809/810

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 4.7k

Ω 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 100k

Ω 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

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