Ken Shirriff reverse engineer the CMOS version of 555 timer IC and explains how it works.
This article explains how the LMC555 timer chip works, from the tiny transistors and resistors on the silicon chip, to the functional units such as comparators and current mirrors that make it work. The popular 555 timer integrated circuit is said to be the world’s best-selling integrated circuit with billions sold since it was designed in 1970 by analog IC wizard Hans Camenzind.
Reverse engineering the popular 555 timer chip (CMOS version) – [Link]
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