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Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
Figue555
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Figue555

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el 555

el 555

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  1. Integrated Circuits & the 555
  2. Integrated Circuits <ul><li>History </li></ul><ul><li>tubes and valves </li></ul><ul><li>transistor - 1947 Bell Labs, Holmdel, NJ </li></ul>
  3. IC Families <ul><li>How logic gates are configured… </li></ul><ul><li>TTL </li></ul><ul><li>CMOS </li></ul>
  4. IC Families <ul><li>TTL - T ransistor- T ransistor L ogic </li></ul><ul><li>CMOS - C omplementary M etal O xide S emiconductor </li></ul>
  5. IC Families <ul><li>TTL - T ransistor- T ransistor L ogic </li></ul><ul><li>74xx designation, i.e., 7447,7490, etc. digital devices </li></ul><ul><li>Requires 5 volt supply (max. 5.5 volts) </li></ul><ul><li>moderately high current draw </li></ul><ul><li>Includes 74Lxx & 74LSxx designations (74L47, 74LS47) that have significantly lower current requirements </li></ul>
  6. IC Families <ul><li>CMOS - C omplementary M etal- O xide S emiconductor </li></ul><ul><li>4000 designation, i.e., 4001, 4511, 4517, etc. </li></ul><ul><li>Works within a range of voltage: 3-15 volts </li></ul><ul><li>Low current requirements </li></ul><ul><li>slightly higher cost than TTL </li></ul><ul><li>very sensitive to static charges (it ruins them) </li></ul>
  7. 555 <ul><li>Introduced in 1972 </li></ul><ul><li>Can accurately time from 0.0000011 seconds to 11,000 seconds (just over 3 hours) </li></ul><ul><li>Uses external capacitor and 1 or 2 resistors to control timing </li></ul><ul><li>Output is always a digital signal (on-off square wave) </li></ul><ul><li>Contains 28 transistors, 12 resistors </li></ul><ul><li>Requires 4.5 - 18 volts </li></ul><ul><li>Will switch 200mA </li></ul>
  8. 555 Timer 555 1 2 3 4 8 7 6 5 DIP chip Dual In-Line Pins top view
  9. 555 Timer 555 1 2 3 4 8 7 6 5 Ground (-) top view +5 to +15VDC
  10. 555 Timer 555 1 2 3 4 8 7 6 5 Ground (-) top view +5 to +15VDC Output <ul><li>High state output is always 1.7V less than supply </li></ul><ul><li>Output is 7.3V @ 9V supply </li></ul>
  11. 555 <ul><li>Monostable timing </li></ul><ul><li>“ One shot” timing </li></ul><ul><li>One stable state (off) </li></ul><ul><li>Switches on for duration of time then goes back to stable (off) state </li></ul>
  12. 555 <ul><li>Astable timing </li></ul><ul><li>No stable state (keeps flip-flopping between states) </li></ul><ul><li>On time called “mark” </li></ul><ul><li>Off time called “space” </li></ul><ul><li>Mark-space timing can be adjusted with external capacitor and two resistors </li></ul>
  13. Monostable circuit 555 8 4 1 7 6 2 3 +9VDC R2 = 1K R1 = 470K C1 = 47mf R3 = 330 LED
  14. Monostable circuit +9VDC R2 = 1K R1 = 470K C1 = 47mf R3 = 330 LED 555 8 4 1 7 6 2 3 +9VDC R2 = 1K R1 = 470K C1 = 47mf R3 = 330 LED 555 8 7 1 2 3 6 5 4
  15. Monostable circuit 555 8 4 1 7 6 2 3 +9VDC R2 = 1K R1 = 470K C1 = 47mf R3 = 330 LED Timing Control Components
  16. Monostable circuit 555 8 4 1 7 6 2 3 +9VDC R2 = 1K R1 = 470K C1 = 47mf R3 = 330 LED Output Components
  17. Monostable circuit 555 8 4 1 7 6 2 3 +9VDC R2 = 1K R1 = 470K C1 = 47mf R3 = 330 LED Note LED polarity
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