HELPPls help Im stucked with some digital stuf

Discussion in 'The Projects Forum' started by Leonid83, Mar 20, 2006.

  1. Leonid83

    Thread Starter New Member

    Mar 20, 2006
    Please email me or post your answer here asap! Thanks a lot!

    1.Why do we need 555 timer circuit in a parallel input serial output register?

    2.A ring counter is also a shift register. In what way does it function as one?

    3.Why do we include a RC network to the input of ring counters?

  2. Papabravo


    Feb 24, 2006
    Your questions are a bit ambiguous and lack meaningful context. I will try to answer them in spite of those difficulties.

    1. A 555 timer is not required in a parallel input serial output register, but some kind of clock signal is required to tell the shift register when to shift.

    2. Each stage of a ring counter takes its input from the previous stage or is a function of the state of the previous stage. The last stage is usually inverted and fed back to the first stage. The relationship between a ring-counter and a shift register is superficial at best.

    3. Any RC network that you see in a digital context is designed to produce a delayed version of its input, or is intended to make the input more immune to noise. Without a circuit diagram it is hard to say what the designer had in mind.