HELPPls help Im stucked with some digital stuf

Thread Starter

Leonid83

Joined Mar 20, 2006
3
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..
 

Papabravo

Joined Feb 24, 2006
13,538
Originally posted by Leonid83@Mar 20 2006, 02:45 PM
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..
[post=15219]Quoted post[/post]​
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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