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You need two dual decade counter, i.e. two chips like 74HC390. Each chip can be configured to divide by 100, so 1Mhz divided by 100 and after divided by 100 gives 100 Hz.
Like meysam said, u need two devide by 10 frequency deviders. U can either make these deviders urself or more easily use available IC chips. As far as I remember the part number that Meysam mentioned is a flexible chip which can operate in a variety of modes, one of which being devide by 10. This, however, shouldnt be confused with the other mode of operation of this chip wich is decade counter.
If you need a 50% duty cycle and your counter depends on giving the output on overfow ,you may need to divide first by 50 then by 2 using a flipflop .This would give a 50% duty cycle .
yes you can use decade counters... there will be a pin called RCO in each counter which produces high at the end of ten counts... connect it to the clock of next counter.... your output will be the RCO of the next counter... but this wont give you 50% duty cycle...
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