Question

1. What is the typical Luminous Intensity of the Vishay TDCR1060M LED Clock Display? (15pt)

2. The Vishay TDCR1060M LED Clock Display emits red light. What is the wavelength of that red light? (15pt)

3. The Vishay TDCR1060M LED Clock Display emits red light. (15pt) What is the frequency of that red light? (Express the answer in THz)

4. The Vishay TDCR1060M LED Clock Display emits red light. (15pt) What is the frequency of that red light? (Express the answer in MHz)

5. Please carefully read the datasheet of SNx4HC595 8-Bit Shift Registers With 3-State Output Registers. http://www.ti.com/lit/ds/symlink/sn74hc595.pdf Suppose we have an 8-bit serial input “01001110”, please a truth table between SER (input) and QA, QB, QC, QD, QE, QF, QG, QH (output). (40pt)

Answer 1

The detailed solution is provided below:

1. Typical luminous intensity of Vishay TDCR1060M LED Clock Display is 6000 micro candela (cd) at a forward current If=10 mA.

2. Vishay TDCR1060M LED Clock Display emits red light. The wavelength of the red light is given by: l=631 nm at forward current If=20mA. Please note that 1nm=10^-9m.

3. Vishay TDCR1060M LED Clock Display emits red light. The frequency of the red light can be calculated from the equation given below: frequency (f) = speed of light (c)/wavelength of light (l)

=3X10⁸/(631X10^-9) Hz = 475.44 X10¹² Hz

= 475. 44 THz (since 1 THz= 10¹² Hz)

4. The relationship between THz and Mega Hartz (MHz) can be expressed as, 1 THz= 10¹² Hz = 10⁶ MHz since 1 MHz= 10⁶ Hz.

Now, the frequency have been evaluated to be equal to (f)= 475. 44 THz. So, in terms of MHz it will be,

f=475.44 X 10⁶ MHz = 4.75 X 10⁸ MHz

All the data for wavelength and luminous intensity have been taken from the data sheet of the mentioned product.

As per the guidelines, first 4 sub parts have been solved.