The functional difference between an S-R flip flop and J-K flip flop is that

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VSSC (ISRO) Technician B: Electronic Mechanic Previous Year Paper (Held on 10 Dec 2017)
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  1. JK flip flop is faster than SR flip flop
  2. JK flip flop has a feedback path
  3. JK flip flop accepts both inputs as 1
  4. JK flip flop does not require external clock

Answer (Detailed Solution Below)

Option 3 : JK flip flop accepts both inputs as 1
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Detailed Solution

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  • In J-K flip flop when both inputs are HIGH, the output toggles i.e. it changes from high to low and low to high periodically when both the inputs are 1.
  • For an SR flip flop, however, when both the inputs are HIGH, we encounter an invalid state, which is not present for a JK flip flop.
  • This is explained with the help of the following function table:
  •  

              

    S

    R

    CLK

    Q

    0

    0

    Q0 (no change)

    1

    0

    1

    0

    1

    0

    1

    1

    Ambiguous (Invalid)

     

    ​Similarly, for a JK flip flop, the block diagram along with the function table is as shown:

    J

    K

    CLK

    Q

    0

    0

    Q (no change)

    1

    0

    1

    0

    1

    0

    1

    1

    Q̅ (toggles)

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