Unit 3/4 Flashcards
Asynchronous Counter
Type of counter in which each flip-flop output serves as the clock input signal for the next flip-flop in the chain
Clock
Digital signal in the form of a rectangular pulse train or a square wave.
Clocked D Flip-Flop
Type of flip-flop in which the D (data) input is the synchronous input
Clocked J-K Flip-Flop
Type of flip-flop in which inputs J and K are the synchronous inputs.
Edge-Sensitive
Manner in which a flip-flop is activated by a signal transition. A flip-flop may be either a positive- or a negative-edge-triggered flip-flop.
Falling Edge
The part of a pulse where the logic level is in transition from a HIGH to a LOW.
Flip-Flop
A sequential circuit based on a latch whose output changes when its CLOCK input receives a pulse.
Frequency
The number of cycles per unit time of a periodic waveform.
Level-Sensitive
Enabled by a logic HIGH or LOW level.
Period
The amount of time required for one complete cycle of a periodic event or waveform.
PRESET
Asynchronous input used to set Q=1 immediately.
Propagation Delays
Delay from the time a signal is applied to the time when the output makes its change.
Sequential Logic
Digital circuitry in which the output state of the circuit depends not only on the states of the inputs, but also on the sequence in which they reached their present states.
Shift Register
Digital circuit that accepts binary data from some input source and then shifts these data through a chain of flip-flops one bit at a time
Synchronous Counter
Counter in which all of the flip-flops are clocked simultaneously.
Trigger
Input signal to a flip-flop or one-shot that causes the output to change states depending on the conditions of the control signals
Decade Counter
Any counter capable of going through 10 different logic states.
Down Counter
Counter that counts from a maximum count downward to 0.
Modulus
The number of states through which a counter sequences before repeating.
Up Counter
Counter that counts upward from 0 to a maximum count.
Up/Down Counter
Counter that can count up or down depending on how its inputs are activated.
