Datasheet

LMC6772
SNOS749F –SEPTEMBER 1995–REVISED MARCH 2013 www.ti.com
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.
16 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated
Product Folder Links: LMC6772