Bistable Mode of 555 Timer

Bistable Mode of 555 Timer

Most of you must have heard about 555 Timer IC. It is most widely used in circuits where oscillation, timer, pulse generation, etc are required. 555 Timer can be used to provide time delays and square pulses. It carries three main operating modes namely Monostable, Astable, and Bistable. Each mode represents a different type of circuit that has a particular output. This IC can also be used to make NOT gate.

Pin Configurations :

It is an 8 pin IC where name of each pin is listed below – :

Pin 1 (Ground) 

Pin 2 (Trigger) 

Pin 3 (Output) 

Pin 4 (Reset) 

Pin 5 (Control) 

Pin 6 (Threshold) 

Pin 7 (Discharge) 

Operation of Bistable Mode

A Bistable Mode or what is sometimes called a Schmitt Trigger has two stable states, high and low. Taking the Trigger input (Pin 2) low makes the output of the circuit go into the high state. On the other hand, taking the Reset input (Pin 4) low makes the output of the circuit go into the low state which is clearly explained in the image below.

Fig. 2: Signal Diagram of Bistable Mode of 555 IC

Project Source Code

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