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GCSE     Sequential Logic     BCD Counting     D Type Flip Flop     D Type Latch     >Decade Counter<     Sequencer     Up Counter    

Sequential Logic Decade Counter


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  GCSE    Sequential Logic  0 of 32    Question 1292    4017 Counter 
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Deadline not set19 of 32    Question 1257    4017 Counter 
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Deadline not set20 of 32    Question 538    D Type Flip Flop 
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Deadline not set21 of 32    Question 540    D Type Flip Flop 
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Deadline not set22 of 32    Question 552    D Type Flip Flop 
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Deadline not set24 of 32    Question 536    D Type Flip Flop Basics 
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Deadline not set25 of 32    Question 537    D Type Flip Flop Counters 
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Deadline not set26 of 32    Question 544    D Type Flip Flop Counters 
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Deadline not set27 of 32    Question 539    D Type Flip Flop Uses 
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Deadline not set31 of 32    Question 1300    D Type Flop FLop 
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Deadline not set32 of 32    Question 988    Sequential Logic 
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CD4017B Decade Counter Chip

On the rising edge of the clock pulse, the next output goes high (moving left to right in the diagram below).
At any time, only ONE output is high.

4017 Decade Counter Data Sheet from Texas Instruments

A Circuit with Reset

View this circuit in the Lushprojects Simulator. The simulation differs from real life because an extra NOT gate is needed.

Here is the correct circuit diagram for the 4017 chip without the NOT gate.

4017 Decade Counter With Reset

Count from 0 to 5, Reset on 6

This counter will count to five. When it hits six, the reset pin goes high and microseconds later the counter has reset. The reset is so fast that no human could ever see it reaching six.

Reset the 4017 Decade Counter

Counter with reset and OR Gates

As this counter goes from 0 to 9, the buzzer will sound when it reaches 0, 2, 4 and 6. This will give four beeps with a short pause before repeating.

If the reset switch is held down, the counter will reset to zero. Pin 0 will be high so the buzzer will sound as long as the reset switch is held down.

4017 Decade Counter with OR Gates

Traffic Lights

The diodes act as OR Gates. If pin 9 is high, following the wires with doides, the left amber light will be shining and the right hand red and amber lights also.

4017 Decade Counter with Diodes used as OR Gates

Drivers are Needed

Real world traffic lights are bright and need much more current than this chip can provide. MOSFET switch driver circuits can be placed between the counter chip and the traffic lights.

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