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# TYPES OF FLIP-FLOPS

الكلية كلية الهندسة     القسم  الهندسة الكهربائية     المرحلة 4
أستاذ المادة ايهاب عبد الرزاق حسين محمد       10/07/2018 17:46:55
The objectives of this lecture are:
• to discuss the difference between combinational and sequential logic as well as the difference between asynchronous and synchronous circuits and to show why the operation of synchronous circuits is more predictable, given propagation delays.
• to explain the operation of the common latches and flip-flops.
- SR or set–reset latch, which may also be called a SR flip-flop.
- D or data flip-flip.
- T or toggle flip-flop.
- JK flip-flop
• to describe clocking and the differences between positive edge and negative edge triggering and discuss the type of control inputs — active high and active low; asynchronous, jam or direct.
Overview:
So far you have encountered with combinatorial logic, i.e. circuits for which the output depends only on the inputs. In many instances it is desirable to have the next output depending on the current output. A simple example is a counter, where the next number to be output is determined by the current number stored. Circuits that remember their current output or state are often called sequential logic circuits. Clearly, sequential logic requires the ability to store the current state. In other words, memory is required by sequential logic circuits, which can be created with boolean gates. If you arrange the gates correctly, they will remember an input value. This simple concept is the basis of RAM (random access memory) in computers, and also makes it possible to create a wide variety of other useful circuits.

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