Basic Operation of a 555 Timer Threshold Control Voltage Trigger Discharge Reset Output.

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Presentation transcript:

Basic Operation of a 555 Timer Threshold Control Voltage Trigger Discharge Reset Output

Functional Diagram of 555 Timer

The 555 Timer Connected as a One-shot. Figure 8--49

One-shot Operation of the 555 timer. Figure 8--50

555 Timer as a One Shot t w = 1.1R1C1 = 1.1(2000  )(1  F) = 2.2ms

555 Timer as a One Shot waveform

Astable operation of 555 Timer t H =.7 (R1+R2)C1 =2.1ms t L =.7R2C1 = 0.7ms

Astable operation of 555 Timer

Less Than 50% Duty Cycle. Figure 8--54

Example Figure 8--55

Astable operation of 555 Timer waveform

555 Timer Datasheet