Sequential digital logic circuits

A Sequential digital logic circuit is different from combinational logic circuits. In sequential circuit the output of the logic device is not only dependent on the present inputs to the device, but also on past inputs.

In other words output of a sequential logic circuit depends on present input as well as present state of the circuit.

Unlike combinational circuits, the sequential circuits have memory devices in order to store the past outputs. In fact sequential digital logic circuits are nothing but combinational circuit with memory.These types of digital logic circuits are designed using finite state machine

Examples of sequential logic circuits are counters, flip flops, constructed using digital logic gates and memory.