14 MUXs, Comparators

14 MUXs, Comparators - ECE 110 M.-C. Brunet Use: Anywhere...

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ECE 110 M.-C. Brunet Multiplexers, and Comparators Handout 14 Use : Anywhere there is a choice between ifferent alternatives different alternatives e.g. Lab : if (sensors are all on white tape) en speed=0 [the car must stop!] else speed= The selection of the choice is controlled by select inputs . 2 x 1 Multiplexer (MUX) The functioning of a MUX can be escribed by a then speed 0 [the car must stop!] else speed … described by a function table 2 x 1 MUX A MUX can be seen as a switch device A B L A B L M.-C. BRUNET ECE 110 UIUC 14.1
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ECE 110 M.-C. Brunet Multiplexers, and Comparators Handout 14 2 x 1 MUX: Inside circuitry? x1 inputs A B S 2 x 1 MUX 0 1 A B L S 0 3 inputs A, B, S 1 output L Truth table L (S, A, B)? S SABL 000 001 L is simply a Boolean output one possible circuit: from canonical SOP! 010 0 1 1 0 1 0 101 (and-or circuit) 1 1 0 111 Other circuits are possible (with fewer gates) M.-C. BRUNET ECE 110 UIUC 14.2 Example 1: Find the truth ble for L: 2 x 1 table for L: MUX 0 1 X 0 L S 0 Y L Truth Table L Function Table M.-C. BRUNET ECE 110 UIUC 14.3
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ECE 110 M.-C. Brunet Multiplexers, and Comparators Handout 14 Example 2: 2 x 1 MUX 0 1 0 Z S 2 x 1 MUX 0 1 S 1 T F X Y Function Tables: X T Y F
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14 MUXs, Comparators - ECE 110 M.-C. Brunet Use: Anywhere...

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