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How many flip flops are in a 16bit counter?

  1. Mar 25, 2007 #1
    1. The problem statement, all variables and given/known data

    How many flip flops are in a 16bit counter? its actually an interview question, not homework per se.

    2. Relevant equations


    3. The attempt at a solution

    I thought it was 4 since we have 2 inputs from 4 flip flops giving us 2^4 = 16 ?
    however i'm told that its essentially just made up with 2 flip flops. How is this possible?
  2. jcsd
  3. Mar 25, 2007 #2
    A 16-bit counter holds 16 bits. You need 16 flip flops to implement it as a ripple counter. Add a few gates to implement it as a synchronous counter.
  4. Mar 26, 2007 #3


    User Avatar

    Staff: Mentor

    Yeah, 4 bits gives 16 counts or states. 16 bits gives many more states....
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