ex2_s06 - University of Florida Department of Electrical...

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University of Florida EEL 3701—Spring 2006 Dr. Eric M. Schwartz Department of Electrical & Computer Engineering Monday, 27 March 2006 24-Apr-06 4:00 PM Exam 2 Page 2/ 11 , Last Name , First Name [3%] 1. Design an active-high switch circuit to the right. Label the output of this switch A(H). The symbols for the two switches you can use are shown below. Draw the switch in its true position. [5%] 2. When we started using the CPLD boards, several students reported that they had LEDs that were sometimes on, but dim. Part of the reason for this is that the CPLD chip uses 3.3V for Vcc, but we use 5V as the high voltage in the LED and switch circuits. There are two possible output values when using the CPLD: 0V and 3.3V. Draw two LED circuits, one that will turn on for an active-low CPLD output [B(L)] and one that will turn on for an active-high CPLD output [C(H)]. Can either of your circuits have a dim LED for a possible CPLD output. If so, what CPLD voltage output will cause the LED to be dim? If so, does the dim LED represent a true or false?
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ex2_s06 - University of Florida Department of Electrical...

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