EXPERIMENT - 1 AIM: To implement 8X1 Multiplexer. 2 TOOLS/APPARATUS:IC 74151, Power supply, Connecting wires, Multimeter, Breadboardetc. 3 STANDARD PROCEDURES: 3.1 Analyzing the Problem: A multiplexer (MUX) is a digital switch which connects data from one of n sources to the output. A number of select inputs determine which data source is connected to the output. The block diagram of MUX with n data sources of b bits wide and s bits wide select line is shown in below figure MUX acts like a digitally controlled multi-position switch where the binary code applied to the select inputs controls the input source that will be switched on to the output as shown in the figure below.At any given point of time only one input gets selected and is connected to output, based on the select input signal. Circuit diagram: 3.2 . IC 74LS151 is used as 8x1 multiplexer IC &pinout for IC 74151 is as below: Pin Diagram MULTIPLEXER IC 74151 3.3 Implementing the Solution •Plug the chips you will be using into the breadboard. Point all the chips in the same direction with pin 1 at the upper-left corner. (Pin 1 is often identified by a dot or a notch next to it on the chip package). •Connect +5V and GND pins of each chip to the power and ground bus strips on the breadboard. •Make the connections as per the circuit diagram. •Switch on VCC and apply various combinations of input according to truth table. •Derive your conclusion. Observation table for example: INPUT SELECT LINE INPUT LINE OUTPUT ENB S2 S1 S0 I7 I6 I5 I4 I3 I2 I1 I0 Y Y’ 0 0 0 0 * * * * * * * I0 I0 0 0 0 1 * * * * * * I1 * I1 0 0 1 0 * * * * * I2 * * I2 0 0 1 1 * * * * I3 * * * I3 0 1 0 0 * * * I4 * * * * I4 0 1 0 1 * * I5 * * * * * I5 0 1 1 0 * I6 * * * * * * I6 0 1 1 1 I7 * * * * * * * I7 Conclusions:- We can conclude that to implement any function we can use multiplexer