Computer-Networks
August 30, 2024Token Ring
August 30, 2024Computer-Networks
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Question 813
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Which of the following has lowest propagation delay?
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ECL
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TTL
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PMOS
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CMOS
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Question 813 Explanation:
● Propagation Delay: It represents the transition time which elapses when the input level changes. The delay which occurs for the output to make its transition is the propagation delay.
● Characteristics of TTL logic:
○ Power dissipation is usually 10 mW per gate.
○ Propagation delays are 10 ns when driving a 15 pF/400 ohm load.
○ Voltage levels range from 0 to Vcc where Vcc is typically 4.75V – 5.25V. Voltage range 0V – 0.8V creates logic level 0. Voltage range 2V – Vcc creates logic level 1.
● Characteristics of Emitter Coupled Logic (ECL)
● The storage time is eliminated as the transistors are used in difference amplifier mode and are never driven into saturation.
● It is the fastest logic family and has the lowest propagation delay.
● Characteristics of TTL logic:
○ Power dissipation is usually 10 mW per gate.
○ Propagation delays are 10 ns when driving a 15 pF/400 ohm load.
○ Voltage levels range from 0 to Vcc where Vcc is typically 4.75V – 5.25V. Voltage range 0V – 0.8V creates logic level 0. Voltage range 2V – Vcc creates logic level 1.
● Characteristics of Emitter Coupled Logic (ECL)
● The storage time is eliminated as the transistors are used in difference amplifier mode and are never driven into saturation.
● It is the fastest logic family and has the lowest propagation delay.
Correct Answer: A
Question 813 Explanation:
● Propagation Delay: It represents the transition time which elapses when the input level changes. The delay which occurs for the output to make its transition is the propagation delay.
● Characteristics of TTL logic:
○ Power dissipation is usually 10 mW per gate.
○ Propagation delays are 10 ns when driving a 15 pF/400 ohm load.
○ Voltage levels range from 0 to Vcc where Vcc is typically 4.75V – 5.25V. Voltage range 0V – 0.8V creates logic level 0. Voltage range 2V – Vcc creates logic level 1.
● Characteristics of Emitter Coupled Logic (ECL)
● The storage time is eliminated as the transistors are used in difference amplifier mode and are never driven into saturation.
● It is the fastest logic family and has the lowest propagation delay.
● Characteristics of TTL logic:
○ Power dissipation is usually 10 mW per gate.
○ Propagation delays are 10 ns when driving a 15 pF/400 ohm load.
○ Voltage levels range from 0 to Vcc where Vcc is typically 4.75V – 5.25V. Voltage range 0V – 0.8V creates logic level 0. Voltage range 2V – Vcc creates logic level 1.
● Characteristics of Emitter Coupled Logic (ECL)
● The storage time is eliminated as the transistors are used in difference amplifier mode and are never driven into saturation.
● It is the fastest logic family and has the lowest propagation delay.
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