Electronics For Dummies by Dickon Ross

Author:Dickon Ross
Language: eng
Format: epub
Publisher: Wiley
Published: 2010-04-21T16:00:00+00:00

Counting on the 4017 decade counter

The 4017 CMOS decade counter shown in Figure 7-12 is a 16-pin IC that counts from 0 to 9 when triggered. Pins 1–7 and 9–11 go from low to high one at a time when a trigger signal is applied to Pin 14. (They don’t go high in order; you have to check the pinout to determine the order.) You can use the count outputs to light up LEDs (as in the ‘Building Brilliant, Blinking, Bright Lights’ section and project in Chapter 14) or trigger a one-shot that controls another circuit.

Counting can take place only when the disable pin (Pin 13) is low; you can disable counting by applying a high signal to Pin 13. You can also force the counter to reset to zero (meaning that the ‘zero’ count output, which is Pin 3, goes high) by applying a high signal (+V) to Pin 14.

Figure 7-12: Pinout of the 4017 CMOS decade counter.

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