ee312report - Mohammed Wahid Makda Cover and Score Sheet...

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Mohammed Wahid Makda Cover and Score Sheet Experiment 9 - Digital Circuits Author: Mohammed W. Makda Partner: Kunal Tripathi Score Item Credit Score D Flip-Flop Made of NAND Gates Truth Table 1 Binary Counters Acquired Waveform; Divide by 2 2 Acquired Waveform; Divide by 4 2 Acquired Waveform; Divide by 8 2 Acquired Waveform; Divide by 16 2 Decade Counter Circuit Diagram 1 Acquired Waveform 2 Gated Oscillator Acquired Waveform 2 Discussion of Timing 1 15/3 Report 15*5/3 TA Signature:________________________ Date:______________________________
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Mohammed Wahid Makda Digital Circuits Mohammed Wahid Makda Department of Computer Science and Engineering State University of New York, Buffalo Buffalo, NY – 14260 Abstract This lab requires us to design and build application circuits using digital ICs. I use the following ICs: 74LS00, 74LS74, and 74LS123. We build a D flip-flop using the NAND gates in 74LS00. To confirm the truth table of the D flip-flop, we would have to change the input values of C and D and measure the corresponding waveforms on the oscilloscope. Hereby, we would confirm the truth table. In the second part, we build binary dividers using the 74LS74. We have to build divide by 2, 4, 8, 16, and decade counters. The decade counter we would eventually build in part 3 after acquiring the prior counters. Each 74LS74 has two binary stages. Hence, we need two 74LS74’s to build divide by 8 and 16 counters. For the decade counter, we need to add a NAND gate from 74LS100. Hence, for a decade counter we would need two 74LS74’s and one 74LS100. For the gated oscillator, we use 74LS123. This part also requires two sets of Ceramic Class-1 capacitors, two sets of resistors, and two sets of potentiometers. In the final part of the experiment, we recall the gated oscillator and experiment it with a function generator.
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Mohammed Wahid Makda 1. Introduction The main purpose of this experiment is for students to design, build and implement application circuits using digital circuits. We use different IC’s and apply their characteristics to build a D flip-flop, to build dividers followed by counters, and to build gated oscillators. We measure the above by acquiring the waveforms in the oscilloscope. 2. Design Specifications a) 2 - 74LS00, 2 – 74LS74, and 1 – 74LS123 IC’s are required. We also need a 5V DC power supply and a function generator. b) We set the values of the function generator to an amplitude of 5V PP and an offset of 1.25V. The function generator acts as a clock signal. c) We also, connect an electrolytic capacitor of 0.1uF between the power supply and the ground to reduce noise level in out waveform. We also need to ensure the polarity of the capacitor by attaching the negative side to the ground and the positive to the power supply. d) Each 74LS74 has two flip-flops. Two stages in a cascade provide a division by four.
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This note was uploaded on 10/14/2011 for the course CSE 312 taught by Professor Staff during the Fall '10 term at SUNY Buffalo.

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ee312report - Mohammed Wahid Makda Cover and Score Sheet...

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