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555 Timer. What are they and what do they do?. What do they do?. Many electronic systems require a timer to control their operation. The popular 555 timer IC can be used to produce two types of timed output. Monostable Astable. What’s inside?. That’s. 16 Resistors. 22 Transistors.

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Presentation Transcript
what do they do
What do they do?
  • Many electronic systems require a timer to control their operation. The popular 555 timer IC can be used to produce two types of timed output.
  • Monostable
  • Astable
what s inside
What’s inside?

That’s

16 Resistors

22 Transistors

2 Diodes

pin configuration and set up
Pin Configuration and Set-Up
  • The 555 is mounted in an 8-pin DIL package
  • Connecting pins 1 and 5 to earth or ground, followed by pins 4 and 8 to the supply, powers up the timer. Output pin 3 powers devices like LED’s, buzzers, small motors or in fact other circuits turning them on or off.
slide5

Trigger, Threshold and Discharge

Trigger - This pin is the input which in turn causes the output to go high.

Threshold - Is one input which causes the output to go low.

Discharge - This pin is connected to the open collector of a NPN transistor (Q14), the emitter of which goes to ground.

monostable
Monostable
  • A monostable has only one stable output state.
  • It is in this stable state with the output at OV.
  • The length of time for which the output is in this ‘temporary’ state is determined by two external components, a resistor and a capacitor.
astable
Astable
  • An Astable has no stable output state.
  • The output will constantly switch between HI and LO.
  • The length of time for which the output is in either of these states is determined by the resistor and capacitor arrangement.