CD4020 14-Stage Binary/Ripple Counter

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The CD4020 is a 14-stage ripple carry binary counter. The IC is a part of the CD4XXX IC series. CD4020 counters advance one count on the negative transition of each clock pulse. The counters are reset to the zero states by a logical “1” at the reset input independent of the clock. The IC offers a wide variety of features such as high noise immunity, low thermal dissipation, and ESD barring. Each I/O pin of the IC is protected from static damage by the use of I/O clamping diodes. The output of the IC always comes in TTL, which makes it easy to interface with other CMOS and TTL devices such as MCUs and MPUs

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What is a Binary Ripple Counter?

A binary ripple counter generally uses a bistable multivibrator circuit so that cache input applied to the counter causes the count to advance or decrease. The Q and Q output terminals are always logically opposite. If the Q output is logical 1 (SET), the Q output then logical 0, If the Q output is logical 0 (REST), then the output is logical 1.A simple Binary ripple counter can easily be made by rigging at least two D – type flip flops.

CD4020 Key Features

Wide supply voltage range: 1.0V to 15V
High noise immunity: 0.45 VDD (typ.)
Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS
Medium speed operation: 8 MHz typ. at VDD = 10V
Schmitt trigger clock input

CD4020 Pinout

Pin No	Pin Name	Description
1	Q12	Counter output 12
2	Q13	Counter output 13
3	Q14	Counter output 14
4	Q6	Counter output 6
5	Q5	Counter output 5
6	Q7	Counter output 7
7	Q4	Counter output 4
8	VSS	Source supply Voltage
9	Q1	Counter output 1
10	CLK 1	Clock signal
11	R	Reset value
12	Q9	Counter output 9
13	Q8	Counter output 8
14	Q10	Counter output 10
15	Q11	Counter output 11
16	VDD	Drain supply Voltage