Functional Block Diagram Of Ic 555 Timer. Ic 555 timer is a well known component in the electronic circles but what is not known to most of the people is the internal circuitry of the ic and the function of various pins present there in the ic. The internal resistors act as a voltage divider network providing 2 3 vcc at the non inverting terminal of the upper comparator and 1 3 vcc at the inverting terminal of the lower comparator.
Internal function diagram of 555 timer. The primary characteristic of this ic is to generate a correct timing pulse. In the 555 timer block or functional diagram comparators are those devices which output is high when their positive input voltage is greater than their negative input voltage and vise versa.
The following block diagram shows the internal and functional block diagram of ic555.
The resistive network contains three equal resistors which will act as a voltage driver. The functional parts of the 555 timer ic consist of a flip flop a voltage divider and a comparator. This block diagram gives all the ideas we need for our further discussion of timer ic 555 it contains a voltage divider two comparators rs flip flops and an npn transistor. The primary characteristic of this ic is to generate a correct timing pulse.
