Logic elements outside. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Logic elements outside. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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A logical element is an electronic device that implements one of the logical functions. On the schematic diagram, a logical element is depicted as a rectangle, inside which the image of a function pointer is placed. The lines on the left side of the rectangle and show the inputs, on the right - the outputs of the element. The figure shows the main logic elements used in digital devices:

element AND (conjunctor &) Y=X1*X2 a;
OR element (disjunctor 1) Y=X1+X2 b;
NOT element (inverter 1) Y=-X c.

Logic elements outside
Fig. 1

In addition to these, there are many logical elements that perform more complex logical transformations. These transformations are combinations of the simplest logical operations. These elements include:

element AND-NOT Y=-(X1*X2) Figure 1,d;
element NOT-OR Y= -X1+(-X2) Figure 1,e;
element OR-NOT Y=-(X1+X2) Figure 1,e;
element AND-OR Y=-(Х1*Х2)+(-(ХЗ*Х4)) figure 1 g. At the output of this element Y=1 if X1=X2=1 or X4=X1=0, in all other cases Y=XNUMX.
element AND-OR-NOT Y=-(X1*X2+X4*X1) figure 0.h. At the output of this element Y=1 with X2=X1=4 or X1=X0=XNUMX. In all other cases Y=XNUMX.

Figure 1, and shows a graphical representation of the modulo 2 adder Y \u1d -X2 * X1 + X2 * (-XXNUMX)).

Figure 2 shows the modulo 2 adder circuit, on the left on the elements AND, OR, NOT on the right AND-OR, NOT

Logic elements outside
Fig. 2

Author: -=GiG=-, gig@sibmail; Publication: cxem.net

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