Logic Families and Their Characteristics - General Questions Online Exam Quiz
Logic Families and Their Characteristics - General Questions GK Quiz. Question and Answers related to Logic Families and Their Characteristics - General Questions. MCQ (Multiple Choice Questions with answers about Logic Families and Their Characteristics - General Questions
What is unique about TTL devices such as the 74SXX?
Options
A : These devices use Schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.
B : The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
C : The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.
D : The S denotes a slow version of the device, which is a consequence of its higher power rating.
Which of the following logic families has the shortest propagation delay?
Options
A : CMOS
B : BiCMOS
C : ECL
D : 74SXX
Why must CMOS devices be handled with care?
Options
A : so they don’t get dirty
B : because they break easily
C : because they can be damaged by static electricity discharge
D : -
Special handling precautions should be taken when working with MOS devices. Which of the following statements is not one of these precautions?
Options
A : All test equipment should be grounded.
B : MOS devices should have their leads shorted together for shipment and storage.
C : Never remove or insert MOS devices with the power on.
D : Workers handling MOS devices should not have grounding straps attached to their wrists.
What should be done to unused inputs on TTL gates?
Options
A : They should be left disconnected so as not to produce a load on any of the other circuits and to minimize power loading on the voltage source.
B : All unused gates should be connected together and tied to V through a 1 k resistor.
C : All unused inputs should be connected to an unused output; this will ensure compatible loading on both the unused inputs and unused outputs.
D : Unused AND and NAND inputs should be tied to V CC through a 1 k resistor; unused OR and NOR inputs should be grounded.
Assume that a particular IC has a supply voltage ( V cc ) equal to +5 V and I CCH = 10 mA and I CCL = 23 mA. What is the power dissipation for the chip?
Options
A : 50 mW
B : 82.5 mW
C : 115 mW
D : 165 mW
Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?
Options
A : Yes
B : No
C : -
D : -
What is the major advantage of ECL logic?
Options
A : very high speed
B : wide range of operating voltage
C : very low cost
D : very high power
As a general rule, the lower the value of the speed–power product, the better the device because of its:
Options
A : long propagation delay and high power consumption
B : long propagation delay and low power consumption
C : -
D : -
What is the range of invalid TTL output voltage?
Options
A : 0.0–0.4 V
B : 0.4–2.4 V
C : 2.4–5.0 V
D : 0.0–5.0 V
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