The 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used.

Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation, etc. Applications include timers, missing pulse detection, bouncefree switches, touch switches, Frequency Divider,Capacitance Measurement, Pulse Width Modulation (PWM) etc.įree Running mode: the 555 can operate as an oscillator. In this mode, the 555 functions as a 'one-shot'.

The 7555 requires slightly different wiring using fewer external components and less power. Also available are ultra-low power versions of the 555 such as the 7555 and TLC555. The 558 is a 16-pin DIP that combines four, slightly modified, 555s on a single chip (DIS & THR are connected internally TR is falling edge sensitive instead of level sensitive). The 556 is a 14-pin DIP that combines two 555s on a single chip.

It includes 23 transistors, 2 diodes and 16 resistors on a silicon chip installed in an 8-pin mini dual-in-line package (DIP-8). The 555 timer is one of the most popular and versatile integrated circuits ever produced. As of 2006, 1.5 billion units are manufactured every year. It is still in wide use, thanks to its ease of use, low price and good stability. The original name was the SE555/NE555 and was called 'The IC Time Machine'. It was designed in 1970 and introduced in 1971 by Signetics (later acquired by Philips). The IC was designed and invented by Hans R. The 555 is an integrated circuit (chip) implementing a variety of timer and multivibrator applications.

The function of the control terminal to change the ?on? or ?high? time of output wave form in astable mode of operation and the output pulse width in monostable mode of ?operation.

The capability of reset terminal to over ride all function and rest the output to low.

?the timer IC in monostable configuration?.

Once a timer is declared fit by this gadget, it will function satisfactorily in whatever mode or configuration you may try it. This is a simple and easy to use gadget which not only testes the IC 555 timer in its entire basic configuration but also tests the functionally of each pin of the timer.

Download free 555 timer pinout