(Solved): Hi there please answer question 9.7 using the second pictures or diagram of 9.5.     ...

Hi there
please answer question 9.7 using the second pictures or diagram of 9.5.

 

 

9-7. The 7442 decoder (BCD-to-decimal decoder) of Figure 9-5 does not have an ENABLE input. However, we can operate it as a 1 -of- 8 decoder by not using the outputs \( \mathrm{O}_{8} \) and \( \mathrm{O}_{9} \) and by using the D input as an ENABLE. This is illustrated in Figure 9-71. Describe how this arrangement works as an enabled 1-of-8 decoder, and state how the logic level at \( \mathrm{D} \) either enables or disables the outputs. \( L= \) LOW Voltage Level (c) Figure 9-71 Figure 9-5 9-5. Figure 9-70 shows how a decoder (74LS138) can be used in the generation of control signals using counters (74LS293). The logic diagram of 74LS293 is given below. It consists of two