Since we have just introduced a new programmer for the CSS555/CSS555C Timer IC’s, now might be a good time to review how to determine the timing components – very easily – using Excel based Timing Calculators. I’m sure most of you know how to do this, but these Timing Calculators make it easier and quickly provide all the information you need.
The Calculators include the “CSS555 Timer Delay Calculator” and the “CSS555 Adjustable Duty Cycle Calculator” for both the CSS555 and CSS555C ICs. They are all available for download from our website on the Standard Product page. I am showing the figure below (the “CSS555C Timer Calculator, Adjustable Duty Cycle) as an example of an input/output page for these calculators.
As you can see, the inputs (Timer Components in the green cells) include the Power Setting (selected), the Supply Voltage, the resistors and capacitor values and the output Multiplier setting (selected). The circuit diagram including on this page indicate the locations of the resistors and capacitor used for timing. The outputs (Calculated Timing Values), include the Output Period, Output Frequency, Output Low & High Time and the Output Duty Cycle. Also the Calculated Supply Currents (Idle Current and Active Current) are shown.
I would like to encourage you to download a Calculator and try it out. Please let us know what you think.