SM72240 Datasheet, PDF (7/15 Pages) Texas Instruments – SM72240 SolarMagic 5-Pin Microprocessor Reset Circuit

SM72240
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SNIS154C – JANUARY 2011 – REVISED APRIL 2013
NEGATIVE-GOING V_CC TRANSIENTS
The SM72240 is relatively immune to short negative-going transients or glitches on V_CC. Figure 12 shows the
maximum pulse width a negative-going V_CC transient can have without causing a reset pulse. In general, as the
magnitude of the transient increases, going further below the threshold, the maximum allowable pulse width
decreases. Typically, a V_CC transient that goes 125 mV below the reset threshold and lasts 40 µs or less will not
cause a reset pulse. A 0.1 µF bypass capacitor mounted as close as possible to the V_CC pin will provide
additional transient rejection.
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0 20 40 60 80 100 120 140 160 180 200
Max Transient Duration (Ps)
Figure 12. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive
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