ECE202

DOA: ................... DIGITAL ELECTRONICS DOS: ....................

HOMEWORK: 4

PART A

1. Analyze the following circuit and explain what it does

2. Design a modulo-5 counter using flip-flop the unused states of which go to one of the valid counting state at next clock trigger.

3. Design a sequence generator with minimum number of flip-flops that generates sequence ‘110001’ repetitively.

4. A). How many flip-flops are required to build a binary counter that counts from 0 to 1023?B). Determine the frequency at the output of last (MSB) flip-flop for an input clock frequency of 2 MHz.c). If the counter is initially at zero, what count it will hold after 2060 clock pulses?

5. Design parallel in serial out register to shift 1101 data. Draw the waveform to show the status of flip flops at every clock pulse.

PART B

6. What is the difference between static RAM and dynamic RAM?7. Design 32kx4 RAM using 16kx4 memory chip.8. A 6 bit DAC has an input of 100101 and a 10 V reference. Find 1). Output voltage produced.

2). Conversion resolution.9. Design R/2R ladder D/A convertor which converts 110 to its equivalent analog output.