555 Timer IC: Working Pin Diagram, Specifications & datasheet
CMOS 555 Timer: Structure Explained and Reverse Engineered « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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LMC555 CMOS Timer datasheet (Rev. M)
Reverse engineering the popular 555 timer chip (CMOS version)
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Reverse engineering the popular 555 timer chip (CMOS version)