Block Diagram of the 555 Timer IC

Figure 1. Internal Block Diagram of the 555 Timer IC

Figure 1 shows the block diagram of the internal circuit of the 555 timer IC. This diagram shows how a very versatile IC like the 555 can also be very simple internally. The excellent design of the 555 timer has made it one of the most widely-used and long-lasting IC's ever.

The 555 circuit consists of just a handful of main components: two comparators, a flip-flop, a discharge path, an output stage, and a resistor network. The timing functions of the 555 depend on how the inputs of the comparators are configured and how the discharge path is used. To get a better understanding of how this block diagram works, please refer to our description of how a 555 IC operates internally.

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