Pseudo Random Sequence Generator

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SUMMARY

The discussion focuses on setting the initial state of a Pseudo Random Sequence Generator using the 74LS74 D-flipflop. Users clarified that the PRESET and CLEAR inputs are active LOW, allowing for asynchronous input to establish the desired initial sequence. By momentarily setting either the PRESET or CLEAR input LOW, the output Q can be configured as needed. The provided datasheet link offers additional technical details for proper implementation.

PREREQUISITES
  • Understanding of 74LS74 D-flipflop operation
  • Knowledge of digital logic design concepts
  • Familiarity with asynchronous input methods
  • Ability to interpret electronic component datasheets
NEXT STEPS
  • Study the 74LS74 D-flipflop datasheet for detailed operational characteristics
  • Learn about asynchronous inputs in digital circuits
  • Explore practical applications of Pseudo Random Sequence Generators
  • Investigate other types of flip-flops and their configurations
USEFUL FOR

Electronics engineers, digital circuit designers, and students learning about flip-flop configurations and Pseudo Random Sequence Generators will benefit from this discussion.

challarao
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1.How to set the initial state of the Pseudo Random Sequence Generator?



2. I'm using 74LS74 D-flipflop.I'm unclear how to use clear and preset enable inputs to set the initial sequence.



3. I tried doing the experiment by directly giving the 0001 sequence through respective D-flipflop's preset inputs.But, I came to know that preset enable inputs, without clock input can be used to give asynchronous input.But, I didn't get any clear idea about how to set any initial sequence for this.Please help me...Please give some reference links...I googled but no direct material is available...My problem lies in not knowing using the preset-enable and clear inputs of 74LS74...please tell how to do that...
 
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According to the datasheet http://www.datasheetsite.com/extpdf.php?q=http%3A%2F%2Fwww.tranzistoare.ro%2Fdatasheets2%2F68%2F68908_1.pdf the PRESET and CLEAR controls are active LOW. Momentarily set one or the other LOW to set Q to what you need. See the FUNCTION TABLE.
 
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Thanks for reply...
I have seen that and it's working now...
 

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