4017B Pin Connections
4017B pin connections
The 4017 available from Rapid Online decade counter has ten outputs which go HIGH in sequence when a source of pulses is connected to the CLOCK input and when suitable logic levels are applied to the RESET and ENABLE inputs.
2. What is a decade counter?
The counting action of the 4017 can be understood from the graph below:
Just one of the individual outputs is HIGH at a time. This is quite different from the behaviour of a BCD counter like the 4510 in which it is the combination of 0's and 1's which represents the count.
As you can see, the ÷10 output is HIGH for counts 0-4 and LOW for counts 5-9.
The 4017 is an extremely useful device for project work and is used in the Games Timerand in various DOCTRONICS construction kits including the Light Chaser and the Matrix Die. When you are familiar with the 4017, you will be able to think of lots of useful applications.
Internally, the 4017 contains five bistable subunits. These are interconnected in a pattern known as a Johnson counter. The outputs of the bistables are decoded to give the ten individvual outputs.
The 4017 is designed to drive higher current loads, so it is OK to connect LEDs with series resistors directly to its outputs. You should assemble the prototype board version of the circuit in stages, checking that each stage is working properly before proceeding the to the next stage.
To see the 4017 in action, you need to build an astable. The easiest way to do this is using a 4093 Schmitt trigger NAND gate integrated circuit. Start by building the astable section on your prototype board: 4. RESET and ENABLE inputs
Modify your circuit so that the RESET and ENABLE inputs are each connected to 0 V through a 10 kW pull down resistor. Initially, the behaviour of the circuit will be unchanged. Add 'flying leads' as indicated below:
What happens when you connect the flying lead from the RESET input temporarily to +9 V?
This returns the counter to 0 and the LED for output 0 is illuminated.
The 4017 available from Rapid Online decade counter has ten outputs which go HIGH in sequence when a source of pulses is connected to the CLOCK input and when suitable logic levels are applied to the RESET and ENABLE inputs.
2. What is a decade counter?
The counting action of the 4017 can be understood from the graph below:
Just one of the individual outputs is HIGH at a time. This is quite different from the behaviour of a BCD counter like the 4510 in which it is the combination of 0's and 1's which represents the count.
As you can see, the ÷10 output is HIGH for counts 0-4 and LOW for counts 5-9.
The 4017 is an extremely useful device for project work and is used in the Games Timerand in various DOCTRONICS construction kits including the Light Chaser and the Matrix Die. When you are familiar with the 4017, you will be able to think of lots of useful applications.
Internally, the 4017 contains five bistable subunits. These are interconnected in a pattern known as a Johnson counter. The outputs of the bistables are decoded to give the ten individvual outputs.
The 4017 is designed to drive higher current loads, so it is OK to connect LEDs with series resistors directly to its outputs. You should assemble the prototype board version of the circuit in stages, checking that each stage is working properly before proceeding the to the next stage.
To see the 4017 in action, you need to build an astable. The easiest way to do this is using a 4093 Schmitt trigger NAND gate integrated circuit. Start by building the astable section on your prototype board: 4. RESET and ENABLE inputs
Modify your circuit so that the RESET and ENABLE inputs are each connected to 0 V through a 10 kW pull down resistor. Initially, the behaviour of the circuit will be unchanged. Add 'flying leads' as indicated below:
What happens when you connect the flying lead from the RESET input temporarily to +9 V?
This returns the counter to 0 and the LED for output 0 is illuminated.