CD4017 BE




The CD4017 is a CMOS (Complementary Metal-Oxide-Semiconductor) decade counter/divider IC (Integrated Circuit). It is commonly used for counting applications and has the capability to turn on 10 outputs sequentially in a pre-defined time and reset the count or hold it when required. The CD4017 IC is often used in LED chasers and other logical output projects.

Here are some key points about the CD4017 IC:

  • Pin Configuration: The CD4017 IC is available in a 16-pin package, such as PDIP (Plastic Dual In-Line Package) or GDIP (Gull Wing Dual In-Line Package).
  • Functionality: The IC consists of 10 Johnson counters with 10 decoded outputs and a carry-out bit. It counts from 0 to 9 or 1 to 10, depending on the configuration.
  • Clock Input: The CD4017 IC takes a clock signal as input and turns on the 10 output pins sequentially in response to each clock pulse.
  • Carry-Out Signal: The IC generates a carry-out signal every 10 clock input cycles, which can be used to ripple-clock the succeeding device in a multi-device counting chain.
  • Voltage Range: The CD4017 IC can operate within a voltage supply range of 3V to 15V, with +5V being commonly used for normal operation.
  • Applications: The CD4017 IC is widely used in various applications, including LED sequencers, timers, controller circuits, binary counters/decoders, frequency division, and divide-by-N counting.


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