What are the types of logic families?

What are the types of logic families?

Types of Logic Family The logic families which fall under the first kind are called bipolar families, this include diode logic (DL), emitted coupled logic (ECL), resistor transistor logic (RTL), diode transistor logic (DTL), transistor transistor logic (TTL).

What are the characteristics of TTL logic family?

The features of the TTL family include the following.

• Logic low level is at 0 or 0.2V.
• Logic high level is at 5V.
• Typical fan out of 10.
• A basic TTL device draws a power of almost 10mW, which reduces with the use of Schottky devices.
• The average propagation delay is about 9ns.
• The noise margin is about 0.4V.

What are the characteristics of CMOS logic family?

Characteristics of CMOS Logic Families

• CMOS supports a very large fan-out, more than 50 transistors.
• It has excellent noise immunity amongst all families.
• A logic low voltage for CMOS is about.
• A logic high voltage for ECL is somewhere between 4.5V to 5V.

What are the characteristics of digital logic families give definitions and its values?

Digital logic family is a group of logic gates constructed using passive devices like a resistor, transistor, diodes, etc. Such devices have compatible logic levels and supply voltage with certain characteristics.

Which is the most commonly used logic family?

Transistor-transistor logic
Explanation: Transistor-transistor logic is the most widely employed logic family. It is the most popular logic family.

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.

What are the advantages of CMOS logic family?

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.

What are the advantages and disadvantages of CMOS logic family?

CMOS logic takes very little power when held in a fixed state. The current consumption comes from switching as those capacitors are charged and discharged. Even then, it has good speed to power ratio compared to other logic types. CMOS gates are very simple.

What do you mean by logic families?

A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually with compatible logic levels and power supply characteristics within a family.

Which is faster TTL or 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 the fastest saturated logic family?

The ECL family is fastest of all logic families.

What are the characteristics of all logic families?

The characteristics which are bound to be identical are supply voltage range, speed of response, dissipation of power, input and output logic levels, current sinking capability, current sourcing capability, noise margin, fan-out etc. When we talk about digital systems actually the digital ICs are the ones which make up the whole system.

How are logic gates built using TTL logic families?

Using TTL logic families, many logic gates can be fabricated in a single integrated circuit. For logic gate built using TTL logic families, input are given to the emitters of the input transistor. In TTL logic family, analog value from 0 V to 0.8 V is logic 0 and 2 V to 5 V is logic 1.

Why are logic families important in digital systems?

But in case ICs belonging to different logic families are used in a digital system then to ensure compatibility interfacing techniques must be used. And that is the reason why we must understand different logic families and use the best combination of ICs during the design of a digital system.

Which is an example of a logic gate family?

Fan-in refers to the number of inputs in a digital logic gate family. For the example given in the figure below, the EX-OR gate has three inputs. So fan-in for the given EX-OR gate is 3. Fan-out refers to the number of inputs that is driven by the output of another logic gates.