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To use this Web page interactively, you must have Microsoft® Internet Explorer 4.01 Service Pack 1 (SP1) or later and the Microsoft Office XP Web Components.
See the Microsoft Office Web site for more information.
This tool helps calculate values for C & R for a CMOS 4047 in free running (astable mode). The beauty of this device is that it gives almost 50% duty cycle without any difficult calculations (unlike the 555).
Download the datasheet here.