LMC6772AIMMX_NOPB Datasheet, PDF (16/25 Pages) Texas Instruments – Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output

LMC6772
SNOS749F – SEPTEMBER 1995 – REVISED MARCH 2013
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Figure 37. Time Delay Generator
The circuit shown above provides output signals at a prescribed time interval from a time reference and
automatically resets the output when the input returns to ground. Consider the case of V_IN = 0. The output of
comparator 4 is also at ground. This implies that the outputs of comparators 1, 2, and 3 are also at ground.
When an input signal is applied, the output of comparator 4 swings high and C charges exponentially through R.
This is indicated above. The output voltages of comparators 1, 2, and 3 swtich to the high state when V_C1 rises
above the reference voltages V_A, V_B and V_C. A small amount of hysteresis has been provided to insure fast
switching when the RC time constant is chosen to give long delay times.
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