Digital electronics 2: sequential and arithmetic logic by Tertulien Ndjountche

By Tertulien Ndjountche

As digital units develop into more and more popular in daily life, electronic circuits have gotten much more advanced and smaller in measurement. This ebook offers the fundamental ideas of electronic electronics in an available demeanour, permitting the reader to understand the rules of combinational and sequential common sense and the underlying concepts for the research and layout of electronic circuits. supplying a hands-on process, this paintings introduces concepts and techniques for developing good judgment equations and designing and interpreting electronic circuits. each one bankruptcy is supplemented with sensible examples and well-designed workouts with labored ideas.

This moment of 3 volumes specializes in sequential and mathematics common sense circuits. It covers a variety of facets on the topic of the next issues: latch and flip-flop; binary counters; shift registers; mathematics and common sense circuits; electronic built-in circuit know-how; semiconductor reminiscence; programmable common sense circuits.

Along with the 2 accompanying volumes, this ebook is an quintessential instrument for college students at a bachelors or masters point looking to enhance their figuring out of electronic electronics, and is designated adequate to function a reference for digital, automation and desktop engineers.

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27(a). Depending on whether the D input state is 0 or 1 the input stage generates, in response to a falling edge of the clock signal CK, the combination (SR) = (01) or (10) that sets the output stage to 1 or resets the output stage to 0. For the other states that can be taken by the clock 26 Digital Electronics 2 signal, the input stage produces the combination (SR) = (00) and the output stage holds its previous state. 26. 18. 27(b), a circle is placed before the triangle at the clock signal input to indicate that the flip-flop is activated by the clock signal falling edge.

Flip-flops with asynchronous inputs Just after power-up, for instance, asynchronous inputs can be used to define initial conditions of a flip-flop, regardless of the states of synchronous inputs and the clock signal in order to prevent any possible hazards. They are generally low active. 32(a) has two asynchronous inputs, P R and CLR, that can be used to determine the output state, regardless of the clock signal. 32(b). 22, the input P R sets the output to 1 (asynchronous preset), and CLR resets the output to 0 (asynchronous clear).

When the clock signal CK takes the 0 logic state, each NAND gate is then set to 1 and the state of the AND gate connected to the output is now only dependent on the feedback signal. This allows the flip-flop to preserve its earlier state. When the clock signal CK changes from 0 to 1, or takes the logic state 1, 32 Digital Electronics 2 the output of each AND gate directly connected to the clock signal is dependent only on the feedback signal. This prevents the flip-flop from changing state. 34. Logic circuit and symbol of the JK flip-flop with asynchronous inputs Edge triggering is implemented by exploiting the difference in propagation delays associated with the clock signal CK, that is applied directly and via the NAND gates to the SR latch.

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