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Danielle asked How to make a 60 second timer in mulitsim?
I'm in a digital electronics class and we are working with flipflops and asynchronous timers right now. Our assignment is to make a timer using two hex displays as the ones and tens place. The tens place is suppose to go up to six and the ones up to nine. After it gets to 60 it should restart. I was wondering if anybody knows how to do it or if they had a picture. I have been working on it for a while and can't figure out how to do it.
And got the following answer:
If it's allowed then the easiest way to do it is to provide a 1 second clock with either a 555 timer (+/- 2% accuracy) or a 32.768KHz clock oscillator divided down (very accurate) followed by a pair of 74192 BCD up/down counters feeding a pair of 7447 BCD to 7 segment decoders. If you have to simulate BCD counters with flip flops the easy way is to check out the schematic of the 74192 in the datasheet and duplicate it (it's four or five J-K flip flops plus some steering logic). http://pdf1.alldatasheet.com/datasheet-pdf/view/23048/STMICROELECTRONICS/74192.html More complicated but it's guaranteed to work. You can simplify it by leaving the parallel load circuitry out.