☉ The 555 Timer IC got its name from the three 5KΩ resistors that are used in its voltage divider network.
This IC is useful for generating accurate time delays and oscillations.
☉ OPERATION ☉
1. Monostable Mode : In this mode, the 555 timer produces a single pulse of a fixed duration in response to a trigger signal. When the trigger (pin 2) is momentarily pulled low, the output (pin 3) goes high and stays high for a specific period. After that, it automatically returns to low.
2. Astable Mode : In this mode, the 555 timer continuously switches between high and low states, generating a square wave . This is commonly used in pulse-width modulation and clock generation applications.
3. Bistable Mode : In this mode, the 555 timer behaves like a bistable multivibrator, where it has two stable states: one output high and one output low. The output remains in the last state until a trigger signal is given to change it.
☉ FEATURES ☉
1. These ICs operate in a broad range of supply voltages ranging from + 5 V to + 18 V.
2. The maximum power dissipation is 600 mW.
3. The operating temperature is 0 to 75 °C
4. The o/p of an IC 555 timer IC can drive a TTL due to its high current o/p.
5. The duty cycle of the 555 timers is variable.
