555 Timer IC (LM555 / NE555 / SE555)

Description

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 pinout:

LM555 features and specification

Features: –

1. 555 is Capable of producing accurate time.
2. It could produce timing from microseconds to hours.
3. Could work in Astable or monostable operation.
4. The output duty cycle is Adjustable.
5. Could be used as PWM.
6.  TTL compatible output can sink or source up to 200mA.

Specification: –

• 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

LM555 Applications:

• Precision timer circuit
• Square wave generator
• Inverter circuits
• PWM generators and motor control
• PPM (Pulse Position Modulation)
• Linear Ramp Generator.

LM555 Dimension and footprint: