One of the classics and may be the most used IC is LM555. The possibilities and number of applications using this chip is phenomenal. LM555 is a precision timer IC, that is capable of producing accurate time delays or oscillation. It can operate in both astable and monostable configurations.
In the time-delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor.
The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. However, these levels can be altered by the use of the control voltage terminal. It has a wide input voltage range from 4.5V to 16V.
LM555 features and specification
- 555 is Capable of producing accurate time.
- It could produce timing from microseconds to hours.
- Could work in Astable or monostable operation.
- The output duty cycle is Adjustable.
- Could be used as PWM.
- TTL compatible output can sink or source up to 200mA.
- Footprint package : PDIP-8
- Minimum Supply Voltage (V) : 4.5
- Maximum Supply Voltage (V) : 16
- No. of Timers/Counters : 1
- Operating Temperature Range (°C) : 0 to 70
- Mounting Type : Through Hole
- Precision timer circuit
- Square wave generator
- Inverter circuits
- PWM generators and motor control
- PPM (Pulse Position Modulation)
- Linear Ramp Generator.
LM555 Dimension and footprint:
Example Projects on LM555:
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