555 Timer Ic Circuit. The lm555 are available in 8 pin pdip soic and vssop packages and is a direct replacement for se555 ne555. 7 2 functional block diagram 7 3 feature description 7 3 1 direct replacement for se555 ne555.
The time intervals can be used for keeping a relay controlled load on or activated for the desired amount of time and an automatic switch off once the delay period has elapsed. In 2017 it was said over a billion 555 timers are produced annually by some estimates and probably the most popular integrated circuit ever made. Its name is derived from three 5k ohm resistors connected in series used in it the timer ic can produce required waveform accurately.
The lm555 are available in 8 pin pdip soic and vssop packages and is a direct replacement for se555 ne555.
The circuit may be triggered and reset on falling waveforms and the output circuit can source or sink up to 200ma or driver ttl circuits. It was commercialized in 1972 by signetics. 7 2 functional block diagram 7 3 feature description 7 3 1 direct replacement for se555 ne555. Derivatives provide two or four timing circuits in one package.
