555 Low Voltage Operation

Published:2013/11/4 20:17:00 Author:lynne | Keyword: 555 Low Voltage Operation | From:SeekIC

I had heard some stories in the past concerning how poorly the 555 ran below Vcc = 5V, so I embarked on an endeavor to see if I could improve operation. The spec sheet specifies minimum Vcc at 4.5V and I tended to believe it. I set up a simple test circuit and ran each of 5 different bipolar 555 devices while varying Vcc. What I learned surprised me. Not only did it run substantially below 5V, but it ran well. Then I tried a CMOS 555 and that worked below 1V. 555 Test Circuit Schematic



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