Block Diagram 555 Timer. Internal block diagram fortunately it is not necessary to understand the internal workings to use it successfully. Pin configuration of 555 timer.
Within the following circuit pins 2 6 are shorted collectively for countless re set off the circuit. The important features of the 555 timer are these. A negative pulse on this pin sets the internal flip flop when the voltage drops below 13vcc causing the output to switch from a low to a high state.
This led will be switched on when button s1 is pressed and switched off when button s2 is pressed.
The pin out diagrams of 555 timer in both the 8 pin packages is shown below. Internal block diagram fortunately it is not necessary to understand the internal workings to use it successfully. There is also a 556 dual version of 555 timer which consists of two complete 555 timers in 14 dip and a 558 quadruple timer which is consisting of four 555 timer in one ic and is available as a 16 pin dip in the market. In short the 555 timer chip works by detecting threshold voltage levels.