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lab3_u11_MSI - University of Florida Department of...

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University of Florida EEL 3701 — Summer 2011 Dr. Eric M. Schwartz Department of Electrical & Computer Engineering Revision 0 27-May-11 Page 1/1 LAB 3: MSI Circuits OBJECTIVES The objective of this lab is to familiarize students with the structure, operation and application of multiplexers and decoders, two common MSI (medium scale integrated) devices. Students will design and build these devices using SSI (small-scale integrated) components. MATERIALS Prototyping board (bread board) Wires, Switches, LED’s, Resistor packs IC's: Any SSI (no MUX or Decoder) chips available in your lab kits Part I. Multiplexer Design The multiplexer (MUX) is a device that acts as a multi- position switch. See Figure 1. A number of DATA inputs are applied to this device (D0-D3) and one of the inputs is switched to the output (Y) of the device. A binary number applied to the SELECT (S1 & S0) lines controls which input is passed to the output. For example, when S1=S0=0, D0 is “logically” connected to the output Y. When S1=0 & S0=1, D1 “logically” connected to Y and so forth for D2 & D3 to connect to Y. Notice that the inputs D2, D3, S1, and S0 are active-high, D0and D1 are active-low, and the output, Y, is active-high.
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