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
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 |
Application
- Control counters
- Timers
- Time-delay circuits
- Frequency dividers
CD4020 Datasheet
You can download the datasheet for CD4020 14-Stage Binary/Ripple Counter IC from the link given below:
See Also: CD4516 Binary Up Down Counter – Datasheet | CD4007 Dual Complementary Pair with Inverter – Datasheet | CD4070 Quad EXCLUSIVE-OR Gate – Datasheet
