Re: interview question
Look at the 555 as a missing pulse detector.
BTW, I todays age, as an EE for a defense subcontractor, I would like to see this implemented in different ways. I would like to see someone suggest some type of RC circuit, but if they suggested a uC, I would take it. An RC solution is going to be a uni-tasker. But the uC will be expandable.
For the same pin count as a 555 and not having to use RC components, I would take a 8-pin uC in any circuit to replace a 555.
Anybody looking for a job in Dallas?
Hope this helps,
Red