Some flip-flops have invalid states.

More Questions from Flip-Flops

• A positive edge-triggered flip-flop changes states with a HIGH-to-LOW transition on the clock input.
• ICs can perform sequential operations, including counting and data shifting.
• It takes four flip-flops to act as a divide-by-4 frequency divider.
• An astable multivibrator is sometimes referred to as a clock.
• The 7476 and 74LS76 are both dual flip-flops.
• An input which can only be accepted when an enable or trigger is present is called asynchronous.
• The key to edge-triggered sequential circuits in VHDL is the ________.
• Setup time specifies ________.
• The inputs on a 7474 D flip-flop are S, R, D, and CLK ________ is/are synchronous.
• An edge-triggered flip-flop can change states only when ________.

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