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LMV7291: Delay circuit via comparator

Part Number: LMV7291
Other Parts Discussed in Thread: TLV7011

Hi team

1. For some reason, I have to use the comparator to achieve a low level delay.

  The desirable Vin and Vout is shown below

  Vin is a pulse whose low level only about 1ms. When the comparator detects the falling pulse of Vin, it needs to extend the low level time of the pulse to about 20ms.

  The high level of input pulse is 1.8V, and the high level of output pulse can be maintained above 0.9V.


2. At first, I wanted to use hysteresis and RC delay at the input to achieve this requirement, but it doesn't seem to work. Could you please help me to analyze the cause and give us a better circuit or via the comparator?

Best Regards