The logic families have fan out more than TTL A. RTL B. ECL C. DTL D. CMOS Choose the correct answer from the options given below.
B and D only
The question asks which logic families have a fan-out greater than TTL (Transistor-Transistor Logic). Let’s go through the options:
- RTL (Resistor-Transistor Logic): RTL typically has a lower fan-out compared to TTL due to its design using resistors which can limit the number of inputs it can drive effectively. Therefore, RTL cannot be the correct answer.
- ECL (Emitter-Coupled Logic): ECL is known for its very high speed and high fan-out capabilities, often greater than TTL, due to its differential amplifier structure and very low input impedance. Therefore, ECL is a possible correct answer.
- DTL (Diode-Transistor Logic): Like RTL, DTL also typically has a lower fan-out compared to TTL due to the limitations imposed by the series diodes in the input. Therefore, DTL cannot be the correct answer.
- CMOS (Complementary Metal-Oxide-Semiconductor): CMOS logic family has a very high fan-out capability compared to TTL. This is because CMOS devices consume power only when switching states, allowing them to drive many inputs with minimal power consumption. Therefore, CMOS is a correct answer.
Thus, the logic families with a fan-out greater than TTL are ECL and CMOS. Based on this analysis, option B ("B and D only") is the correct choice.
Similar Questions
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Important Questions from Logic Families
What is the voltage at the output node of the given circuit? Assume $V_{DD} = 1.8V$ and threshold voltage of the transistor $V_{TN} = 0.4V$ and body bias effect is negligible.
Arrange in ascending order based on power dissipation the following logic families :
(i) ECL
(ii) TTL
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List – I List – II a. I2L i. XOR b. high impedance state ii. non-saturation logic c. controlled inverter iii. tristate d. ECL iv. bipolar logic Codes :
Match the following lists in terms of power dissipation/Gate:
List – I List – II a. BiCMOS i. 6 mW b. ECL ii. 2.75 μW c. CMOS (AHC) iii. 25 mW to 73 mW d. bipolar TTL (F) iv. 17 μw Choose the correct answer from the codes given below:
Arrange the following in terms of decreasing order of power dissipation :
(a) CMOS
(b) ECL
(c) TTL
(d) MOS
The correct sequence of decreasing order of power dissipation is
