SM72375_14 Datasheet, PDF (11/20 Pages) Texas Instruments – SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output

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ONE-SHOT MULTIVIBRATOR
SM72375
SNIS155D – NOVEMBER 2010 – REVISED APRIL 2013
Figure 27. One-Shot Multivibrator
A monostable multivibrator has one stable state in which it can remain indefinitely. It can be triggered externally
to another quasi-stable state. A monostable multivibrator can thus be used to generate a pulse of desired width.
The desired pulse width is set by adjusting the values of C₂ and R₄. The resistor divider of R₁ and R₂ can be
used to determine the magnitude of the input trigger pulse. The SM72375 will change state when V₁ < V₂. Diode
D₂ provides a rapid discharge path for capacitor C₂ to reset at the end of the pulse. The diode also prevents the
non-inverting input from being driven below ground.
BI-STABLE MULTIVIBRATOR
Figure 28. Bi-Stable Multivibrator
A bi-stable multivibrator has two stable states. The reference voltage is set up by the voltage divider of R₂ and
R₃. A pulse applied to the SET terminal will switch the output of the comparator high. The resistor divider of R₁,
R₄, and R₅ now clamps the non-inverting input to a voltage greater than the reference voltage. A pulse applied to
RESET will now toggle the output low.
ZERO CROSSING DETECTOR
Figure 29. Zero Crossing Detector
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