Datasheet

SM72375
www.ti.com SNIS155D –NOVEMBER 2010–REVISED APRIL 2013
Figure 31. Time Delay Generator
Figure 32. 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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