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This mode is also used to generate clock pulse signals for digital IC’s. This wave is usually used to turn ON and OFF a load at specific intervals like, blinking a LED. In this mode a square wave is produced at the output pin. It has dual comparators and flip-flop which will make this IC operated in three different modes such as Astable, Monostable and Bistable(Schimitt) Mode.

There are three resistors of value 5K, which gives this IC it’s iconic name “555 Timer”. They are very simple to understand if we take a look at the components present inside as shown below They can adopt itself into various applications due to its different operating modes. Note: The above values are mentioned for PDIP package, Complete Technical Details can be found in the 555 Timer datasheet given at the end of this page.ĥ55 Timer IC is the most commonly used ICs for timing and Pulse generation applications. Available in 8-pin PDIP, SOIC, and VSSOP packages.Operating Temperature is 70 degree Celsius.Trigger Voltage is 1.67 when operating at +5V.

Consumes up to 3mA when operating at +5V.

The source/sink current of the output pin is 200mA.

Typical operating voltage is +5V, can withstand a maximum of +18V.

Supply Voltage (Typical = 5V, Maximum = 18V) 7 I It toggles the output from high to low when voltage reaches 2/3 of the supply voltage Open collector output which discharges a capacitor between intervals (in phase with output). The 6 I amplitude of voltage applied to this terminal is responsible for the set state of the flip-flop An external voltage applied to this pin can also be used to modulate the output waveformĬompares the voltage applied to the terminal with a reference voltage of 2/3 Vcc. It determines the pulse width of the output 5 Voltage I waveform. When not used for reset 4 I purposes, it should be connected to VCC to avoid false triggeringĬontrols the threshold and trigger levels. Negative pulse applied to this pin to disable or reset the timer. This pin is normally connected to load as it is the only pin with output driven waveform The output of the timer depends 2 I on the amplitude of the external trigger pulse applied to this pin Responsible for transition of the flip-flop from set to reset.