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
    3
    0
    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?

    Regards..
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    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.
     
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