61651. Four J-K flip-flops are cascaded with their J-K inputs tied HIGH. If the input frequency (fin) to the first flip-flop is 32 kHz, the output frequency (fout) is ________.
61652. A gated S-R flip-flop goes into the SET condition when S is HIGH, R is LOW, and EN is HIGH.
61653. VHDL does require a special designation for an output with a feedback.
61654. A negative edge-triggered flip-flop will accept inputs only when the clock is LOW.
61655. The term CLEAR always means that .
61656. PRESET and CLEAR inputs are normally synchronous.
61657. VHDL was created as a very flexible language and it allows us to define the operation of clocked devices in the code without relying on logic primitives.
61658. The Q output of a flip-flop is normally HIGH when the device is in the "CLEAR" or "RESET" state.
61659. An astable multivibrator is sometimes referred to as a clock.
61660. The 7476 and 74LS76 are both dual flip-flops.
61661. The 7475 is an example of an IC D latch (also called a bistable latch) that contains four transparent D latches.
61662. In VHDL, each instance of a component is given a name followed by a semicolon and the name of the library primitive.
61663. The 555 timer can be used in either the astable or monostable modes.
61664. ICs can perform sequential operations, including counting and data shifting.
61665. An input which can only be accepted when an enable or trigger is present is called asynchronous.
61666. A J-K flip-flop and associated waveforms are shown below. The circuit is operating properly.
61667. All multivibrators require feedback.
61668. The propagation delay time tPLH is measured from the triggering edge of the clock pulse to the LOW-to-HIGH transition of the output.
61669. The J-K flip-flop is a standard building block of clocked (sequential) logic circuits known as logic standard primitives.
61670. A latch can act as a contact-bounce eliminator.
61671. Connecting components together using HDL is not difficult.
61672. A flip-flop's normal starting state when power is first applied to a circuit is always the SET state.
61673. Latches are tristate devices whose state normally depends on asynchronous inputs.
61674. Using knowledge from previous chapters, an S-R flip-flop circuit is easy to design.
61675. Inputs that cause the output of a flip-flop to change instantaneously are asynchronous.
61676. A one-shot is a special type of multivibrator that must be triggered to produce each output pulse.
61677. 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.
61678. The J-K flip-flop eliminates the invalid state by toggling when both inputs are high and the clock transitions.
61679. A D-type latch is able to change states and "follow" the D input regardless of the level of the ENABLE input.
61680. A positive edge-triggered flip-flop changes states with a HIGH-to-LOW transition on the clock input.
61681. When using edge-triggered flip-flops, the data is entered into the flip-flop on the leading edge of the clock, but the output does not change until the trailing edge of the clock.
61682. A D latch has one data-input line.
61683. The 7474 has two distinct types of inputs: synchronous and asynchronous.
61684. Most basic latches and flip-flops are available in IC packages of eight latches or flip-flops with a common clock.
61685. Edge-triggered flip-flops can be identified by the triangle on the clock input.
61686. Parallel data transfers between two different sets of registers require more than one shift pulse.
61687. A TOGGLE input to a J-K flip-flop causes the Q and outputs to switch to their opposite state.
61688. When the output of the NOR gate S-R flip-flop is and , the inputs are .
61689. Edge-triggered J-K flip-flops make it hard for design engineers to know when to accept input data.
61690. A one-shot circuit is also known as a timer.
61691. The S-R flip-flop has no invalid or unused state.
61692. Pulse-triggered flip-flops are identified by a bubble on the Q output terminal.
61693. Some flip-flops have invalid states.
61694. Multivibrators must be level-triggered.
61695. Simple gate circuits, combinational logic, and transparent S-R flip-flops are synchronous.
61696. A flip-flop is in the CLEAR condition when .
61697. Pulse-triggered or level-triggered devices are the same.
61698. A D flip-flop is constructed by connecting an inverter between the SET and clock terminals.
61699. It takes four flip-flops to act as a divide-by-4 frequency divider.
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