Help needed in digital issues

Discussion in 'General Electronics Chat' started by Leonid83, Mar 20, 2006.

  1. Leonid83

    Thread Starter New Member

    Mar 20, 2006
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    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?

    Pls email me or reply to this topic...thanks!
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    1,790
    I could swear that I posted a reply to this question and it seems to have disappeared.

    1. You do not need a 555 timer circuit in a parallel input serial output register. You do need some kind of clock signal to tell the shift register to shift.

    2. In a ring counter the next value of each stage is a function of the previous stage. The last stage is normally inverted and fed back to the input of the first stage. The connection between a ring counter and a shift register is superficial at best.

    3. An RC network in a digital context is designed to produce a delayed version of a signal or to provide some minimal amount of noise immunity. This is generally speaking a questionable practice.

    Without a diagram of the circuit it can be hard to imagine what the designer had in mind.
     
  3. Papabravo

    Expert

    Feb 24, 2006
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    I understand now, almost identical question posed in two different forums. Tsk...Tsk.
     
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