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    Ripple up counter - Logic Design

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    Using positive edge-triggered D-type bistables with clear and preset terminals (74LS74) and some logic, design a MOD-6 ripple-up (0,1,2,3,4,5,0...) counter that can also be manually reset with an external push button.

    1. Draw the circuit block diagram, labelling the LSB & MSB.
    2. Ignoring the generation of glitches, briefly explain how the circuit works.
    3. Draw the count sequence showing the effects of propagation delay.

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