A number > 0 of 555 timer tutorials warn against holding the trigger of a 555 timer in monostable configuration low for longer than the duration of the output pulse. Why not?
Answer
As I understand it, the output simply will not go high until the trigger goes high. If the timer times out before the trigger goes high, you will no longer have a uniform pulse-width.
This datasheet has a good description of the behavior: http://www.datasheetarchive.com/pdf-datasheets/Datasheets-25/DSA-494116.html
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