Wednesday, September 16, 2015

4017 Decade Counter

4017 IC has 11 output terminals. Pin 3 goes high when the count is zero. Pin 2 goes high when the count is 1 and so on. Unlike 4026 IC, just one of the individual outputs is HIGH at a time. This property make it useful for building a LED Sequencer. In this circuit, a number of LEDs turn on and off in sequence. The 555 astable circuit provides input clock pulses to the 4017 through pin 14. Pin 13 (disable) and pin 15 (reset) are connected to logic LOW voltage.

1 comment:

  1. In the description says pin 13,15 are connected to low voltage, but in the diagram they are to connected to + ?

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