Unit 3 Sequential Logic

Question 0

Binary Counter

Answer 0

Group of flip-flops connected in a special arrangement in which the states of the flip-flops represent the binary number equivalent to the number of pulses that have occurred at the input of the counter

Question 1

Asynchronous Counter

Answer 1

Type of counter in which each flip-flop output serves as the clock input signal for the next flip-flop in the chain

Question 2

Decade Counter

Answer 2

Any counter capable of going through 10 different logic states

Question 3

Down Counter

Answer 3

Counter that counts from a maximum count downward to 0

Question 4

Modulus

Answer 4

The number of states through which a counter sequences before repeating

Question 5

Modulus N Counter

Answer 5

A counter with a modulus of N

Question 6

Synchronous Counter

Answer 6

Counter in which all of the flip-flops are clocked simultaneously

Question 7

Up Counter

Answer 7

Counter that counts upward from 0 to a maximum count

Question 8

Up/Down Counter

Answer 8

Counter that can count up or down depending on how its inputs are activated

Question 9

Asynchronous Inputs

Answer 9

Flip-Flop inputs that can affect the operation of the flip-flop independent of the synchronous and clock inputs

Question 10

Clock

Answer 10

Digital signal in the form of a rectangular pulse train or a square wave

Question 11

Clocked D Flip-Flop

Answer 11

Type of flip-flop in which the D (data) input is the synchronous input

Question 12

Clocked J-K Flip-Flop

Answer 12

Type of flip-flop in which inputs J and K are the synchronous inputs

Question 13

D Latch

Answer 13

Circuit that contains a NAND gate latch and two steering NAND gates

Question 14

Duty Cycle

Answer 14

Fraction of the total period that a digital waveform is in the HIGH state. DC=th/T

Question 15

Edge-Sensitive

Answer 15

Manner in which a flip-flop is activated by a signal transistion

Question 16

Falling Edge

Answer 16

The part of a pulse where the logic level is in transition from a HIGH to a LOW

Question 17

Flip-Flop

Answer 17

A sequential circuit based on a latch whose output changes when it’s clock CLOCK input receives a pulse

Question 18

Frequency

Answer 18

The number of cycles per unit time of a periodic waveform

Question 19

Level-Sensitive

Answer 19

Enabled by a logic HIGH or LOW level

Question 20

Period

Answer 20

The amount of time required for one complete cycle of a periodic event or waveform

Question 21

PRESET

Answer 21

Asynchronous input used to set Q=1 immediately

Question 22

Propagation Delays

Answer 22

Delay from the time a signal is applied to the time when the output makes its change

Question 23

RESET/CLEAR

Answer 23

Asynchronous input used to set Q=0 immediately

Question 24

Rising Edge

Answer 24

The part of a pulse where the logic level is in transition from a LOW to a HIGH

Question 25

Sequential Logic

Answer 25

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

Question 26

Shift register

Answer 26

Digital circuit that attempts binary data from some input source and then shifts these data through a chain of flip-flops one bit at a time

Question 27

State Machines

Answer 27

A sequential circuit that advances through several defined states

Question 28

Trigger

Answer 28

Input signal to a flip-flop or one-shot that causes the output to change states depending on the conditions of the control signals