Datasheets say 10mA per/output pin...
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20 led can be powered from a single 4017 output X-ZONE ( PRANJAL)
The two most likely reasons are:you want to count in decimal for a human readable displayyou want to divide the pulse rate of a signal by multiples of ten (i.e. a decade)
The 4017 IC is a decade (divide by ten) counter with decoded outputs. Internally, there is a 4 bit counter, with feedback to reset at 10 instead of 16, followed with a ten output decoder that makes each state available on a separate pin of the IC.Another answerOne of my favorite IC's, the 4017 decade counter/divider.The 4017 takes a clock pulse in and then steps the output from negative to positive in a series of ten steps, with only one pin being on at a time. It has the unique capability of counting up to a certain number and then restarting the count, counting up to a certain number and halting, or it can be cascaded to more 4017's for a higher count.The outputs are labeled 0 through 9. It can sink about 10 ma. of current per pin and is a very versitile IC. It operates from 3 VDC. to 15 VDC.Do a Google search and in parenthesis type in "LM4017". You'll be rewarded with all kinds of technical info which you can download and print.
what is the function of ic 4017 in clapswitch?