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555 Timer IC

Image: 
555 Timer | IC 555 | NE555

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DataSheet: 

555 is a very commonly used IC for generating accurate timing pulses. It is an 8pin timer IC and has mainly two modes of operation: monostable and astable. In monostable mode time delay of the pulses can be precisely controlled by an external resistor and a capacitor whereas in astable mode the frequency & duty cycle are controlled by two external resistors and a capacitor. 555 is very commonly used for generating time delays and pulses.

 

Pin Diagram: 
555 Timer PinOut | IC 555 | NE555 pin diagram
Pin Description: 

 Pin No
 Function
 Name
1
Ground (0V)
Ground
2
Voltage below 1/3 Vcc to trigger the pulse
Trigger
3
Pulsating output
Output
4
Active low; interrupts the timing interval at Output
Reset
5
Provides access to the internal voltage divider; default 2/3 Vcc
Control Voltage
6
The pulse ends when the voltage is greater than Control
Threshold
7
Open collector output; to discharge the capacitor
Discharge
8
Supply voltage; 5V (4.5V - 16 V)
Vcc



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