It was mentioned that there are two different ways to connect two or more electrical devices together in a circuit. They can be connected by means of series connections or by means of parallel connections. When all the devices in a circuit are connected by series connections, then the circuit is referred to as a series circuit. When all the devices in a circuit are connected by parallel connections, then the circuit is referred to as a parallel circuit. A third type of circuit involves the dual use of series and parallel connections in a circuit; such circuits are referred to as compound circuits or combination circuits. The circuit depicted at the right is an example of the use of both series and parallel connections within the same circuit. In this case, light bulbs A and B are connected by parallel connections and light bulbs C and D are connected by series connections. This is an example of a combination circuit
By Engineer
Muhammad Zaheer Meer GMS
· A sequential circuit uses flip flops. Unlike combinational logic, sequential circuits have state, which means basically, sequential circuits have memory.
· The main difference between sequential circuits and combinational circuits is that sequential circuits compute their output based on input and state, and that the state is updated based on a clock. Combinational logic circuits implement Boolean functions, so they are functions only of their inputs, and are not based on clocks.
Simple..
Combinational Circuit does not depend on the previous and next state inputs but this seqential circuit are dependent on those factors..
sequential circuit uses Flipflops.. but combi dont..!
Clock pulse transition plays a dominant role in sequential cicuit
A question that.... questions your logic.
· A sequential circuit uses flip flops. Unlike combinational logic, sequential circuits have state, which means basically, sequential circuits have memory.
· The main difference between sequential circuits and combinational circuits is that sequential circuits compute their output based on input and state, and that the state is updated based on a clock. Combinational logic circuits implement Boolean functions, so they are functions only of their inputs, and are not based on clocks.
easier to troubleshoot
turn things on one ata time can see where it stopped
everything at once any part could be the problem
The inrush and starting load can be greatly reduced
A combinational logic circuit is one that the output depends only on the current input, not on any previous inputs. An easy example would be a decoder -- you have n inputs, and 2^n outputs, one for each possible set of inputs. What the output is doesn't have anything to do with what the previous output was.
A sequential logic circuit depends on the previous input. Memory is one of the easiest examples of this - it's output is what it's last input was. If you take away the input (depending on how it's built), then its output will stay the same as long as the material electrical properties allow. Its output depends on what its previous input was.
Another example of a sequential logic circuit is a master-slave flip-flop. You input a value, and its output remains the same until the next clock cycle, at which the output changes to what the previous input was, and the input is whatever you decide to put in.
A combinational circuit can be defined as a circuit whose output is dependent only on the inputs at the same instant of time where as a sequential circuit can be defined as a circuit whose output depends not only on the present inputs but also on the past history of inputs.
For a sequential circuit, the values of the variable are usually specified at certain discrete time instants rather than over the whole continuous time. Half Adder, Full Adder, Half Subtractor, Full Subtractor are examples of combinational circuits whereas Flip-Flops, Counters form the sequential circuit.
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