I am using an LTC6993-3 timer chip and I am using it to generate a positive output pulse of approximately 27 seconds. It is triggered from a high to low transition on the trigger pin and this transition is produced by a comparator. This device is non-retriggerable. My set resistor is 649 KΩ and my top DIV resistor is 1 MΩ and the bottom DIV resistor is 887 KΩ. Most of the time i get the 27 second pulse out but sometimes the positive out is so short in time that it is hard to find. Is there a time between the trigger signal being received and the output changing states during which the LTC6993-3 trigger signal can be overridden? Does anyone have a suggestion for what could be causing this? The environment is very noisy and I am having the board relayed out to try to address the noise issues.
Thank you for any help anyone can provide.
Thanks for your question.
It sounds like your question is based around t-width or t-arm. Can you draw a timing diagram of the input condition that causes this issue that you are describing?
Also, what supply voltage are you using. This shouldn't matter, but if I try to reproduce what you are seeing, I'd like to have a setup as close as possible to yours.