Sequential Circuits Flashcards
(31 cards)
Transition in a digital signal
Signal Edge
Transition from Low to High
Rising Edge
transition from high to low
falling edge
if the state change occurs from a low to high
active high
if the state change occurs from high to low
active low
time during which the value of the clock signal is 1 or high
clock width
time between successive transitions in the same direction
clock period
ratio of the clock width
duty cycle
reciprocal of the clock period
clock frequency
it oscilliates between high and low states, produce a continuous output, digital circuits that implement feedback
multivibrators
free running multivibrator
astable
one-shot multivibrator and one stable state
monostable
it causes the circuit to enter the unstable state
trigger pulse
flip flop that has two stable states
bistable
the output is only a function of all inputs and any combination of inputs
combinational circuit
outputs depend not only on the present input value but also the past input value
sequential circuit
combination of secondary input variables at the given time
present state
combination of secondary input variables for the next clock cycle
next state
transition of states and outputs values at discrete instance of time generated by a clock source
synchronous
transition of states are initiated by the combination of inputs and it has no clock synchronisation
asynchronous
change state with specific logic and denoted by an enable pin
level triggering
identified from the straight lead from the clock input
high-level triggering
identified from the clock input read along with the low state indicator bubble
low-level triggering
change its state when the clock toggles
edge triggering
