Pin 2: Trigger Terminal: The trigger pin is used to feed the trigger input hen the 555 IC is set up as a monostable multivibrator. Pin 1: Grounded Terminal: All the voltages are measured with respect to the Ground terminal. These pins are explained in detail, and you will get a better idea after going through the entire post. The pin numbers used below refers to the 8-pin DIP and 8-pin metal can packages. The use of each pin in the IC is explained below. This IC consists of 23 transistors, 2 diodes and 16 resistors. The pin configuration is shown in the figures. The 555 Timer IC is available as an 8-pin metal can, an 8-pin mini DIP (dual-in-package) or a 14-pin DIP. IC Pin Configuration 555 Timer IC Pin Configuration More features are listed in the datasheet.Ģ. The maximum power dissipation per package is 600 mW and its trigger and reset inputs has logic compatibility.

The duty cycle of the timer is adjustable.It has a temperature stability of 50 parts per million (ppm) per degree Celsius change in temperature, or equivalently 0.005 %/ ☌.The output of a 555 timer can drive a transistor-transistor logic (TTL) due to its high current output.The external components should be selected properly so that the timing intervals can be made into several minutes along with the frequencies exceeding several hundred kilohertz.Sinking or sourcing 200 mA of load current.It operates from a wide range of power supplies ranging from + 5 Volts to + 18 Volts supply voltage.The important features of the 555 timer are : The NE 555 can be used for a temperature range between 0° to 70☌. The SE 555 can be used for temperature ranges between – 55☌ to 125 °. The timer IC is set up to work in either of the two modes – one-shot or monostable or as a free-running or astable multivibrator. Apart from its applications as a monostable multivibrator and astable multivibrator, a 555 timer can also be used in dc-dc converters, digital logic probes, waveform generators, analog frequency meters and tachometers, temperature measurement and control devices, voltage regulators etc. When compared to the applications of an op-amp in the same areas, the 555IC is also equally reliable and is cheap in cost. It is basically a monolithic timing circuit that produces accurate and highly stable time delays or oscillation. The 555 timer IC was introduced in the year 1970 by Signetic Corporation and gave the name SE/NE 555 timer.

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