Digital Design Questions

• What would be the output voltage of a 7814 voltage regulator?
• An optocoupler is an integrated circuit with an LED and a zener diode encased in the same package.
• Setup time specifies:
• Can the automatic RC circuit be used to set a flip-flop rather than reset the flip-flop?
• How much setup time (ts) is required for the 74LS76?
• A 0.01-µF capacitor is recommended by TTL manufacturers for ________ the power supply.
• Why would a delay gate be needed for a digital circuit?
• Why is the Schmitt trigger needed in the 60-Hz TTL-level clock pulse generator?
• Look up the propagation delay from the clock to the output for the 7476. Are the HIGH-to-LOW and LOW-to-HIGH propagation delays the same?
• In the automatic reset circuit for a flip-flop, how long does it take the capacitor to completely charge?
• A settable flip-flop's normal starting state when power is first applied to a circuit is always the ________ state.
• What is the difference between setup time and hold time?
• Which of the following circuit parameters would be most likely to limit the maximum operating frequency of a flip-flop?
• Is the propagation delay from the clock to the output for the 7476 the same as the delay from the set or reset to the output?
• Decoupling capacitors should be tied from VCC on one device to ground on a different device.
• The purpose of a pull-up resistor is to keep a terminal at a ________ level when it would normally be at a ________ level.
• Why does the data sheet for the 7476 only give a minimum value for the clock pulse width (both HIGH and LOW)?
• A Schmitt trigger:
• A Schmitt trigger has VT+ = 2.0 V and VT– = 1.2 V. What is the hysteresis voltage of the Schmitt trigger?
• Why should a LED be pulled LOW from a logic gate rather than pulled HIGH?