Each IC family has its own characteristics, limitations and advantages. There have been many improvements in logical families such as TTL and CMOS. Logic (DTL); Transistor-Transistor Logic (TTL); Emitter Coupled Logic (ECL). Evolution of TTL family. • ECL. • CMOS family and its evolution. • Overview. 2 Diode-Transistor Logic (DTL) . Scaling capabilities (large integration all MOS). Logic Families – TTL, CMOS, ECL. 10 January Basic Logic Families indicate the type of logic circuit used in the IC. The main types of logic families are.

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The drawback in using RTL gates is that they draw a great amount of current from the power supply. Interconnecting any two logic families often required special techniques such as additional pull-up resistorsor purpose-built interface circuits, since the logic families may use different voltage levels to represent 1 and 0 states, and may have other interface requirements only met within the logic family.

High-level supply current, ICC 1: Because CMOS and TTL families can now operate at similar speeds and similar power consumption, the 74HCT a CMOS sub-family compatible with TTL pinouts and voltage levels now makes it possible to easily interface both families within in a single design, so enabling the use tl the best features of each family.

A whole range of newer families has emerged that use CMOS technology.

Logic family – Wikipedia

While using this site, you agree to have read and accepted our terms of use and privacy policy. Wikipedia articles needing clarification from July After studying this section, you should be able to: The German physicist Walter H. Views Read Edit View dogital. The first diode—transistor logic family of integrated circuits was introduced by Signetics in Rigital Logic Circuits Some families were also introduced as individual components which were used to design integrated circuits and also to interconnect them.


RTL resistor-transistor logic and DTL diode-transistor logicsuccessfully used in early computers were superseded by TTL transistor-transistor logicwhich became the dominant technology. Finite State Machines Topics.

This is the supply current when the output of the gate is at logic 1. There is no power dissipation gtl CMOS. A CMOS gate draws no current other than leakage when in a steady 1 or 0 state. The extremely small capacitance of the on-chip wiring caused an increase in performance by several orders of magnitude.

Separately Excited DC Motor. In transistor-transistor logic, the logic gates are constructed around the transistors. The output circuit has also been modified in recent years and the the configuration is called “Totem pole”. Modified Digutal Full Wave Rectifier. The required silicon area for implementing such digital CMOS functions has rapidly shrunk.

CMOS chips often work with a broader range of power supply etl than other logic families. Also within each family, there is a range of voltages which may be high level or low level. Not shown are some early obscure logic families from the early s such as DCTL direct-coupled transistor logicwhich did not become widely available. This logic family bypasses TTL in terms of speed.

Logic family

ICs of a particular family generally use a common technology, but ICs in other families, using different technologies, usually have different input and output requirements, different supply voltages, and other parameters that affect the use of digital ICs. This is an initiatory website for a simplified information about basics of electronics for beginners and advanced professionals.


However the laws of physics, as presently understood, say that this is not possible.

Diodes can also be famolies as a logical switch. So that it is large enough for electrical connections to be made. In Digital Electronicsa logic family refers to digital integrated circuit devices which are constructed witha combination of electronic gates.

Online tutorials designed are mainly intended to understand the basic concepts of electronics engineering. That is the reason for its high speed operation. The input sections of TTL consists of a phase splitter transistor and an input transistor. ECL is also a non-saturated logic. Programmable Logic Devices 7.

cms This is the maximum current which the gate can sink in 0 level. It was first introduced in Fan-out output load factor is the maximum number of inputs that can be driven by a logic gate.

Module 3.1

Values are very typical and would vary slightly depending on application conditions, manufacturer, temperature, and particular type of logic circuit. In fact, it is the fastest bi-polar circuit available today. Analog Integrated Circuits These design styles can typically be divided into two main familiws, static techniques and clocked dynamic techniques. These input signals are then inverted and amplified. The basic Classification of the Logic Families are as follows: