4017 - Decade counter

The 4017 is a CMOS decade counter/divider IC with 10 decoded outputs and a built-in 5-stage Johnson counter. It advances one output for each clock pulse, making it ideal for sequencing applications like LED chasers or timers. It features reset and clock enable pins, operates from 3V to 15V, and is known for low power consumption and ease of use in digital logic circuits.

CD4017BE decade counter in PDIP-16 package
Fig.: CD4017BE decade counter in PDIP-16 package

Applications

Specifications/Features

Supply Voltage Range 3V to 15V
Maximum Clock Frequency 5 MHz at 10V
Output Current ±10 mA (typical)
Number of Outputs 10 decoded outputs
Operating Temperature -55°C to +125°C

📄 CD4017B datasheet (609 kB)

Connections

Terminal diagram of the 4017
Fig.: Terminal diagram of the 4017
Pin Name Function
16 Vcc Power supply (+6V to +15V)
8 GND Ground connection
15 Reset Master Reset: When set HIGH, the counter resets and Output 0 goes HIGH
14 Clock The counter advances on a rising clock edge when this pin is HIGH
13 Clock inhibit Stops the counter from advancing when this pin is HIGH
12 Carry out Carry bit; used to cascade additional counters
1-7, 9-11 Q0, Q1, ...Q9 Outputs that go HIGH when active

Further information

Last edited by Christian Grieger on 2025-05-10
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