E6C Digital ICs: families of digital ICs; gates; programmable logic devices

- [[E6C01]] (A)
  What is the function of hysteresis in a comparator? #card
	- [[A.]] To prevent input noise from causing unstable output signals
	- [[B.]] To allow the comparator to be used with AC input signals
	- [[C.]] To cause the output to continually change states
	- [[D.]] To increase the sensitivity
- [[E6C02]] (B)
  What happens when the level of a comparator’s input signal crosses the threshold voltage? #card
	- [[A.]] The IC input can be damaged
	- [[B.]] The comparator changes its output state
	- [[C.]] The reference level appears at the output
	- [[D.]] The feedback loop becomes unstable
- [[E6C03]] (A)
  What is tri-state logic? #card
	- [[A.]] Logic devices with 0, 1, and high-impedance output states
	- [[B.]] Logic devices that utilize ternary math
	- [[C.]] Logic with three output impedances which can be selected to better match the load impedance
	- [[D.]] A counter with eight states
- [[E6C04]] (C)
  Which of the following is an advantage of BiCMOS logic? #card
	- [[A.]] Its simplicity results in much less expensive devices than standard CMOS
	- [[B.]] It is immune to electrostatic damage
	- [[C.]] It has the high input impedance of CMOS and the low output impedance of bipolar transistors
	- [[D.]] All these choices are correct
- [[E6C05]] (D)
  Which of the following digital logic families has the lowest power consumption? #card
	- [[A.]] Schottky TTL
	- [[B.]] ECL
	- [[C.]] NMOS
	- [[D.]] CMOS
- [[E6C06]] (C)
  Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply? #card
	- [[A.]] Large bypass capacitance is inherent
	- [[B.]] The input switching threshold is about twice the power supply voltage
	- [[C.]] The input switching threshold is about half the power supply voltage
	- [[D.]] Bandwidth is very limited
- [[E6C07]] (B)
  What best describes a pull-up or pull-down resistor? #card
	- [[A.]] A resistor in a keying circuit used to reduce key clicks
	- [[B.]] A resistor connected to the positive or negative supply used to establish a voltage when an input or output is an open circuit
	- [[C.]] A resistor that ensures that an oscillator frequency does not drift
	- [[D.]] A resistor connected to an op-amp output that prevents signals from exceeding the power supply voltage
- [[E6C08]] (B)
  In Figure [[E6-3]], which is the schematic symbol for a NAND gate? #card
  ![image.png](../assets/image_1746132038698_0.png)
	- [[A.]] 1
	- [[B.]] 2
	- [[C.]] 3
	- [[D.]] 4
- [[E6C09]] (B)
  What is used to design the configuration of a field-programmable gate array (FPGA)? #card
	- [[A.]] Karnaugh maps
	- [[B.]] Hardware description language (HDL)
	- [[C.]] An auto-router
	- [[D.]] Machine and assembly language
- [[E6C10]] (D)
  In Figure [[E6-3]], which is the schematic symbol for a NOR gate? #card
  ![image.png](../assets/image_1746132038698_0.png)
	- [[A.]] 1
	- [[B.]] 2
	- [[C.]] 3
	- [[D.]] 4
- [[E6C11]] (C)
  In Figure [[E6-3]], which is the schematic symbol for the NOT operation (inversion)? #card
  ![image.png](../assets/image_1746132038698_0.png)
	- [[A.]] 2
	- [[B.]] 4
	- [[C.]] 5
	- [[D.]] 6