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Timer IC Unit Operation

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Timer IC Unit Operation

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    1. Timer IC Unit Operation By: Diana Mae G. Cubillas ICS 30 A

    2. Timer IC The figures above is the 555 timer, an analog-digital IC. As described in the figures, it is made of linear comparators and digital flip-flops. The one on the left is the internal of the IC and the one on the right is its external view.

    3. Operational Modes One-Shot Mode (Monostable Multivibator) Has a single stable state, which is off state Generates a single pulse of a fixed time duration each time it receives an input trigger pulse Astable Multivibrator (Clock Circuit) Simply an oscillator Generates a continuous stream of rectangular off-on pulses that switch between two voltage levels

    4. Monostable Multivibrator

    5. Uses of One-Shot Mode turning some circuit or external component on or off for a specific length of time generate delays

    6. Astable Operation

    7. Formula Difference Astable operation Thigh = 0.7 (ra + rb)c Tlow = 0.7rbc t = Thigh + Tlow Monostable operation Thigh = 1.1 ra c

    8. Waveforms of Astable Operation

    9. Waveforms of Monostable Operation

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