Palestine Technical College. Engineering Professions Department. EEE Digital Logic Fundamentals. Experiment 2.

Transcription

1 Palestine Technical ollege Engineering Professions epartment EEE - Experiment ode onverters # Student No Name Surname Sign Fall 07-0

2 EEE Objectives: uild a Gray code to binary converter. Use design steps of combinational circuits in designing a Gray code to binary converter. Use a -to seven-segment decoder and seven-segment display to show the equivalent of number in decimal Equipment and materials: igital trainer Wires 70 resisters Seven-segment LE display () Integrated circuits (Is): 7 quadruple -input XOR gates 77 -to-seven segment decoder 7-XOR gate 77 -to-seven segment decoder 7 Segment LE isplay 7 Synchronous up/down -it inary ounter

3 EEE Gray to binary esign and construct a combinational circuit with -inputs and -outputs that converts a -bit gray code into the equivalent -bit binary number as given in table.. Simplify the table using K-map method and implement the circuit using XOR gates only. Table.. Gray to binary conversion. ecimal Gray inary w x y z

4 EEE -to-seven segment decoder 7- Segment LE display (common anode) is not an I, but light-emitting diodes (LEs). It contains 7 discrete LEs on a small printed circuit board. ll LE anodes are tied together (ommon node) and each LE cathode comes out to an individual package pin. The sevensegment display is used to display any one of the decimal digits 0 through. However, to-seven segment decoder accepts a decimal digit in and generates the corresponding seven-segment code. onstruct the -to-7 segment decoder circuit shown in the figure.. e sure to connect pin to + volts and pin to ground of the 77 I, pin of the 7- segment display to + volts through 0-ohm resistor, and the output of the 77 is applied to the inputs of the sevensegment display. pply the combination of -bit binary through switches SW-SW and monitor the decimal display output at the 7-segment display. SW SW SW SW 7 77 I/RO RI LT a' b' c' d' e' f' g' ohm GN Figure.. -to-seven segment decoder. Table.. -to-seven segment decoder. ecimal Seven segment a b c d e f g

5 Logic SWs EEE. What is your observation on the -bit inputs and 7-bits output patterns of table.?. Synchronous -bit binary counter onstruct the synchronous -bit binary counter circuit shown in the figure.. The connection of 77 I & 7-segment display is the same as in figure. except that pin & are connected to. Either you connect pin or to the LK switch (Hz pulse) & the other pin to of the 7 I. ouble check your connections before you perform the experiment. You will monitor the counter output on the 7-segment display, and you will step up/down the counter by feeding Hz pulse train into pin or of 7 I. SW SW SW SW ' 0 UP N Load LR 7 GN Q Q Q Q 7 I/RO RI LT 77 GN a' b' c' d' e' f' g' 0 0 ohm Figure. Synchronous -bit binary counter.. The counter is counting up when connecting pin to & pin to.. The counter is counting down when connecting pin to & pin to.. Set up the SWs to 00, and connecting pin to Hz pulse train & pin to. epress the ' pushbutton and hold it, note the number in the 7-segment display. Release the ' logic switch and record your observation on the result?.. epress & hold the logic switch while the counter is counting, what happens to the 7- segment display?. Release the logic switch, and record your observation on the result?