CD4022 is TTL logic Octal Counter IC. It has eight output pins which increments from zero to eight for every input clock pulse. The maximum clock frequency is 5Mhz and is commonly used in digital counters, LED drivers, and other digital arithmetic applications.
|Pin Number||Pin Name||Description|
|1 to 6 and 7,10,11||Output pins 0 to 7||These are the 8 output pins on which the counting occurs, they are not in order hence verify pin diagram above|
|8||Vss or Ground||Connected to the Ground of the circuit|
|12||Carry Out (CO)||This pin goes high after the IC counts from 1 to 10. This is used as carry while counting.|
|13||Clock Enable (EN)||This is an input which when made high will hold the count at the current state|
|14||Clock||The counting happens when this clock pulse goes high , this pin is normally connected to 555 timer or other uC to produce a pulse|
|15||Resets||As the name suggests this pin resets the count back to 1|
|16||Vdd / Vcc||Connects to the supply voltage typically +5V|
· High speed 16 pin CMOS Decade counter
· Supports 10 decoded outputs
· wide supply voltage range from 3V to 15V, typically +5V
· TTL compatible
· Operating Clock Frequency: 5 Mhz
· High Level Output Voltage: 4.5V @5V Vcc
· High Level Output current: 0.36mA
· Available in 16-pin PDIP, GDIP, PDSO packages
Where to use CD4022 IC
The IC CD4022 is used for counting applications, it has the capability to turn on 8 outputs sequentially in a pre-defined time and reset the count or hold it when required. It also has the capability to indicate the status of counting using Carry pin. This is commonly used for LED chasers and other logical output projects, where you need to perform arithmetic operations. It is also called as Divide by 8 Counter since the carry pin produces one clock pulse for every 8 pulses on the clock pin. So if you are looking for a sequential decoded counting IC that can count up to 8 then this IC will be your right choice.
How to use a CD4022 IC
The IC can work from 3V to 15V, but normally powered with +5V to the Vdd/Vcc pin and the Ground/Vss pin is connected to ground. We have 8 output pins ranging from Q0 to Q7, these pins can be connected to any load but we are using LEDs here as shown in the circuit below.
This IC will increment the count from 0 to 7 (Q0 to Q7) each time it senses a high pulse from the clock pin (pin 14). So we need a clock source to keep this IC ticking, this clock source can be a simple 555 Timer circuit that could generate pulse or a microcontroller like Arduino, PIC etc to generate our custom pulse using I/O pins.
· Used in LED matrix, LED chaser and other LED projects
· Binary counter or Binary decoder
· Can be used for divide by N counting
· remote metering, automotive, medical electronic
· Instrumentation and Alarm systems