NE555 is mainly used as a timing circuit, for example, it can control delay, period, time delay and frequency division, etc. This IC is used in a variety of applications including signal generation, timing, and digital signal processing.
Part number : NE555, NE555P, NE555PS, NE555PW
Function: Precision Timer
Package : DIP 8, SOP 8 Pin Type
Manufacturer: Texas Instruments, Philips Semiconductor
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Description
The NE555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200 mA.
Pinout ( Pin diagram )
1. GND (Ground): A ground pin for the flow of charge.
2. TRIG (Trigger): This is a pin that receives the input signal used to start the timer operation.
3. OUT (Output): This is the pin that generates the output signal of the timer.
4. RESET: This pin receives the input signal used to initialize the timer.
5. CTRL (Control Voltage): This is a pin that controls timing using an external voltage.
6. TH (Threshold): This is a pin that sets the threshold to stop the timer operation.
7. DIS (Discharge): This pin discharges the external capacitor.
8. VCC (Power): This pin supplies power to the IC.
Features
1. Turn-off time less than 2 µs
2 Max. operating frequency greater than 500 kHz
3. Timing from microseconds to hours
4. Operates in both astable and monostable modes
5. High output current
6. Adjustable duty cycle
7. TTL compatible
8. Temperature stability of 0.005% per °C
Simplified Schemetic
Applications
1. Precision timing
2. Pulse generation
3. Sequential timing
4. Time delay generation
5. Pulse width modulation
Frequently Asked Questions?
Q1. What is the operating voltage range of NE555?
A1. This IC has a typical operating voltage range from 4.5V to 16V. all.
Q2. Are there any other timer ICs similar to NE555?
A2. This IC is an old IC, and recently, more advanced timer ICs include LM555, TLC555, etc.
Reference sites
1. https://www.ti.com/product/NE555
2. https://en.wikipedia.org/wiki/555_timer_IC
NE555 Datasheet
