In ECL, the transistors are never in saturation , the input/output voltages have a small swing (0.8 V), the input impedance is high and the output impedance is low. As a result, the transistors change states quickly, gate delays are low, and the fanout capability is high.
Does ECL have least propagation delay?
Compared to TTL and its su-families, ECL is a much faster architecture and was widely used in computing architecture for some time. ECL offers propagation delay reaching ~1 ns , making it useful with GHz clock rates.
Which logic family has lowest propagation delay?
Among the given options, TTL has the least propagation delay.
Why ECL is the fastest of all logic families?
Explanation: ECL is the fastest of all the logic families because of the emitters of many transistors are coupled together which results in the highest transmission rate . Explanation: The full form of CML is Collector Mode Logic. Explanation: ECL (Emitter Coupled Logic) can also be named as CML(Collector Mode Logic).
Why TTL is faster than CMOS?
TTL chips are generally faster than CMOS gates (but see ACT series), however there are two logic technologies faster than TTL-Emitter-coupled logic (ECL) and gallium arsenide (GaAs). These chips come at considerable cost in power consumption and ease of interface to other logic families.
Which is better CMOS or TTL?
Which one is Better? The advantage of the CMOS over the TTL chips is that the CMOS has a higher density of logic gates within the same material. TTL chips consume more power as compared to the power consumed by the CMOS chips even at rest. ... A very minute amount of static electricity could cause damage to the CMOS chips.
Which has highest noise margin?
| — VOH Margin | TTL [5volt] 2.4v 300mV | FCT [5volt] 2.5v 300mV | BTL [5 volt] 2.1v 370mV | GTL [5 volt] 1.5v 400mV |
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Which has the lowest propagation delay?
| Q. The digital logic family which has the lowest propagation delay time is | B. ttl | C. cmos | D. pmos | Answer» a. ecl |
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Which has the lowest propagation delay time?
| 1) TTL | 2) ECL | 3) PMOS | 4) CMOS | 5) NULL |
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How can propagation delay be reduced?
A common practice to reduce the propagation delay of long digital bus lines is to insert repeaters (implemented as single inverters, all with the same size) at uniform distance in the bus lines [4, 6, 10, 12, 15].
Which logic gate is faster?
Emitter-coupled-logic (ECL) is a BJT logic family that is generally considered the fastest logic available. ECL achieves its high-speed operation by employing a relatively small voltage swing and preventing the transistors from entering the saturation region.
Which logic family is fastest?
The ECL family is fastest of all logic families.
How many and gates are required for a 1 to 8 multiplexer?
For a 1 to 8 multiplexer a total of 8 AND gates are required.
What does the C in CMOS stand for?
CMOS ( complementary metal-oxide semiconductor ) is the semiconductor technology used in the transistors that are manufactured into most of today’s computer microchips.
Why do we use CMOS?
CMOS technology is used for constructing integrated circuit (IC) chips , including microprocessors, microcontrollers, memory chips (including CMOS BIOS), and other digital logic circuits. ... Two important characteristics of CMOS devices are high noise immunity and low static power consumption.
What is the major advantage of CMOS logic?
The main advantage of CMOS logic family is their extremely low power consumption . This is because there is no direct conducting path from Vdd to ground in either of input conditions. So there is practically zero power dissipation in STATIC conditioms.
