The 555 timer can be used in either the astable or monostable modes.

More Questions from Flip-Flops

• The Q output of a flip-flop is normally HIGH when the device is in the "CLEAR" or "RESET" state.
• The S-R flip-flop has no invalid or unused state.
• A one-shot circuit is also known as a timer.
• Generally, a flip-flop's hold time is short enough so that its output will go to a state determined by the logic levels present at its synchronous control inputs just prior to the active clock transition.
• Inputs that cause the output of a flip-flop to change instantaneously are asynchronous.
• When the output of the NOR gate S-R flip-flop is and , the inputs are .
• Some flip-flops have invalid states.
• 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.

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