Microsoft Word - Digital Logic Design v_4_6a

3.8. Beyond Standard Logic: Applications

 Precision Timers “555”
This device is a precision timer that may be configured for a variety of applications. The most
common use of the NE 555 is an application to generate square waves that may be used as a clock
signal in digital design. In order for NE 555 to generate the clock signal, it may be configured as
shown below:

 Example

Given the component values in the introduction of NE 555 (above), draw the clock (square wave)

signal generated and determine the period, frequency and duty cycle for the signal.

Solution: