Question: Which Logic Gate Is Fastest?

Which logic family has highest noise immunity?

CMOS Logic FamiliesCharacteristics of CMOS Logic Families CMOS supports a very large fan-out, more than 50 transistors.

It has excellent noise immunity amongst all families..

Can you mix CMOS and TTL?

If I understand correctly, there is no problem connecting CMOS outputs to TTL inputs if the fan-out is OK, but connecting TTL outputs to CMOS inputs may give issues with the voltage levels.

Why NAND gates are faster than NOR?

In general, cells are designed to have similar drive strength of pull up and pull down structures to have comparable rise and fall time. NAND gate has better ratio of output high drive and output low drive as compared to NOR gate. Hence NAND gate is preferred over NOR.

What is RTL DTL TTL?

Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. … *TTL contrasts with the preceding resistor-transistor logic (RTL) and diode-transistor logic (DTL) generations by using transistors not only to amplify the output but also to isolate the inputs.

Which logic family has less power consumption?

CMOSCMOS started out in the 1970’s as the 4000 series family, but its virtue of low static power consumption, and breakthroughs in speed thanks to narrow channel fabrication, have allowed CMOS to become the technology of choice for highly integrated circuits. In 1991 CMOS is the most widely used digital logic process.

Which logic family is fastest?

Emitter-coupled logic (ECL)Emitter-coupled logic (ECL) is a BJT-based logic family which is generally considered as 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.

Why is a pull up resistor needed for an open collector gate?

A pull-up resistor connects unused input pins (AND and NAND gates) to the dc supply voltage, (Vcc) to keep the given input HIGH. … Some open-collector gates, such as the 74LS06 are capable of driving larger loads because their outputs can be connected to supplies of up to 30 volts via an external pull-up resistor.

How many and gates are required for a 1 to 8 demultiplexer?

How many AND gates are required for a 1-to-8 multiplexer? Explanation: The number of AND gates required will be equal to the number of outputs in a demultiplexer, which are 8.

Is CMOS faster than TTL?

As the CMOS consists of the FET’s and the TTL circuits are made up of BJT, CMOS chips are much faster and efficient. There is a much higher density of the logic functions in a single chip in CMOS as compared to the TTL. … CMOS chips could have the TTL logics and could be used for the replacement of the TTL IC.

Which of the following logic circuits is the fastest?

ECLExplanation: 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.

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.

Which gate is faster NAND or NOR?

Although in NAND gate pmos are in parallel and in NOR they are in series, so NAND gate is faster than NOR.

Which is faster TTL or ECL?

ECL eliminates saturation and improves speed but uses more power than other logic families such as TTL and CMOS. ECL is fastest logic family among all and this is due to avoidance of saturation region for application. … ECL gates provide both true as well as complemented outputs.

Why do we prefer NAND gates more than NOR?

NAND uses transistors of similar sizes. When considering gates with more inputs, NOR gates requires transistors of 2 different sizes whose size difference is more when comparing with NAND gates. If either input is low, a single Pmos resistance drives the output high.

Which CMOS gate is faster?

Which gate is faster? Explanation: NOR gate is faster. NAND is more complex than NOR and thus NOR is faster and efficient.