Nnnncomparison between logic families pdf

This page compares ttl vs cmos vs ecl logic families and mentions difference between ttl and cmos and ecl based on various parameters such as fanout,power consumption,noise immunity etc. For cmos, pd is staticdynamic 1mhz and figure of merit is calculated for each. In this article, you will find the study notes on logic families which will cover the topics such as integrated circuits, characteristics of digital circuits, logical families, digital ic terminology, dl, rtl, dtl and ttl. Parenting tips using love and logic big kids do it in the potty and other adventures pdf end childhood swearing pdf end the bedtime blues pdf helping aggressive toddlers and preschoolers get started before its too late. The mechanisms by which they fail are different thanks. Each family has its own advantages and limitations. I dont have the book and i dont remember anything else about it. Difference between ttl cmos ecl ttl vs cmos vs ecl. Transistortransistor logic ttl is a logic family built from bipolar junction transistors. Overview integration, moores law early families dl, rtl ttl evolution of ttl family ecl cmos family and its evolution overview 2.

Review the performance of complex digital circuits by considering the effects of using different logic families for interfacing between technologies and analogue systems ive. 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. Initially launched as straight 7400 series integrated circuits, this logic ic family has spawned many variants which has enabled it to remain in use until this. Compare the characteristics of different logic families. A faster logic family called fast schottky f was also introduced that was faster than normal schottky ttl. Integrated circuits integrated circuits ics are chips, pieces of semiconductor material, that contain all of the transistors, resistors, and capacitors necessary to. Cmos is sensitive to fanoutthe number of gates attached to the output of a driver gate. Comparison of logic families using nand gate by ijret editor. Transistor transistor logic ttl emitter coupled logic ecl cmos logic family. Logic families and their characteristics ee280 lecture 8 9 2 ttl transistortransistor logic standard logic family. Power, delay, and powerdelay products are some of the performance parameters considered for comparison between various logic families.

Demonstrate an understanding of common fault types and an understanding of fault. You may wonder why the nand gate is so popular in the ttl logic families. Ecl emitter coupled logic suitable for systems requiring highspeed operations mos. Demonstrate an understanding of logic families and their terms used in their speci. Ti provides over 60 functions, including gates, buffersdrivers, bus transceivers, flip flops, latches, counters, multiplexers, and demultiplexers in the 74f logic family. It draws a certain amount of current during its operation. Each gate is connected to a power supply vcc vdd in the case of cmos. Logic guide introduction and contents todays applications are evolving with greater functionality and smaller size. In fact, it combines diodes and resistors so sometimes it is known as dioderesistor logic drl. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.

Each of these approaches is called a specific logic families. It has always been at least an order of magnitude better in propagation delay and skew when compared with cmos and ttl logic. Ttl stands for transistor transistor logic, cmos stands for complementary metal oxide semiconductor and ecl stands for emitter coupled logic. Ttl transistortransistor logic and cmos complimentary metal oxide semiconductor are the two main families of microchips. Digital integrated circuits are produced using several different circuit configurations and production technologies. Logic levels the voltage ranges representing 0 and 1 represent the logic levels of the circuit often logic 0 is represented by a voltage close to 0 v but the allowable voltage range varies considerably the voltage used to represent logic 1 also varies greatly. Commercially it starts with the 74 series like the 7404, 74s86 etc. Dec 30, 2018 different circuit configurations and production technologies are used during the production of digital integrated circuits. The power dissipation of cmos logic deppyppgends heavily upon the operating frequency of the logic. Demonstrate an understanding of time division multiplex tdm 3. It is extremely simple and inexpensive because it only uses passive components. Each logic family provides chips with a variety of logic functions such as logic gates, buffers, flipflops, and counters.

Many ttl logic gate s are typically fabricated onto a singleintegrated circuit ic. This document describes the main logic families and their characteristics. Integrated injection logic i 2 l family comparison of different logic families. They deliver speed and drive on a par with ttl, quashing worries about highspeed systems built with cmos alone. Cmos complementary metal oxide semiconductor made from mosfets. Although there are many manufacturers of digital ics and several logic families, a fair amount of terminology associated with digital ics is somewhat standardized between the various manufacturers and logic families.

Since dl does not use active components such as transistors, it does not provide. Logic families digital electronics wiley online library. Interfacing between different logic families all about circuits. The introduction of advanced lowpower schottky als further increased speed and reduced power consumption. Many logic family s different components each contains one or more basic logical fun.

Each such approach is called a specific logic family. Ttl transistortransistor logic, made of bipolar transistors. This ic is usually referred to as a monolithic ic first introduced in 1958. While you can, to a large extent, connect up logic gates of a given family on a single board just by following some quite simple rules, if you want to interface between different logic families, or use logic gates to drive external circuitry, or conversely use external circuitry to provide inputs to logic gates, you will need to have a deeper. In electronic logic, a logic level is represented by a voltage or current, which depends on the type of electronic logic in use. The physical representation of the binary logic states in these families are high. Logic gates are manufactured in a range of logic families the ability of a gate to ignore noise is its noise immunity both mosfets and bipolar transistors are used in gates all logic gates exhibit a propagation delay when responding to changes in their inputs the most widely used logic families are cmos and ttl. Logic gates are primarily implemented electronically using diodes or transistors, but can also be constructed using electromagnetic relays, fluidics, optics, molecules, or even mechanical elements. Digital logic families electronics and communication.

Overview integration, moores law early families dl, rtl. The codes used vary between manufacturers, but package details are usually included on the ic datasheet. In this module, the differences and similarities between the various families of logic ics available are described, along with their important operating conditions. And8059d a comparison of lvds, cmos, and ecl prepared by. In this chapter, we will discuss different logic families used to hardwareimplement different logic functions in the form of digital integrated circuits. The quick reference attributes charts on page 3may be a good. The types of logic devices are classified in families, of which the most important are ttl and cmos.

Accordingly a variety of logic ic families spawned, each offering different capabilities and facilities. Comparision of logic families watch more videos at lecture by. What are the basic differences between cmos and ttl signals. Circuit complexity gives measure of number of transistors or gates within single package. Introduction in digital electronics, a logic family refers to digital integrated circuit devices which are constructed witha combination ofelectronic gates. Comparison of logic families comparison of logic families this entry was posted in digital electronics on may 12, 2017 by nikhilarora. Ppt logic families and their characteristics powerpoint. Interfacing logic familiesinterfacing logic families when using ttl logic to drive cmos logic the high level voltage of the ttl output must be increased with a pullup resistor. Ttl transistortransistor logic families history and. Sep 03, 2016 ttl logic in transistortransistor logic ttl, logic gates and other digital circuits are made using bipolar junction transistors and resistors.

Jan 26, 2018 comparision of logic families watch more videos at lecture by. It was build in 1961 by james l bui and commercially used in logic design in 1963. All logic families have key specifications that their parts abide to. The ecl emitter coupled logic families, originated in the late 1950s and remain the fastest chips available, but consume more power, and because they use a negative power supply of. Basic of logic family logic family is monolithic digital integrated circuit which is in group of the logic gates construction using the several different design. The speed of operation of the logic gate is the time that elapses between giving input and getting output.

Families of logic gates for use in real circuits umass amherst. Ttltransistortransistor logic ttl is a digital logic design in which bipolar transistor s act on directcurrent pulses. Analyze internal circuitry of a ttl nand gate for both high and low output states. Table 1 shows the comparison between rtl, dtl, ttl and cmos logic families under the nor and nand logic. Introduction of digital logic families miniature, lowcost electronics circuits whose components are fabricated on a single, continuous piece of semiconductor material to perform a highlevel function.

Ecl emitter coupled logic for extremely high speeds. Cmos logic families many families of logic exist beyond static cmos comparison of logic families for a 2input multiplexer briefly overview. Fred zlotnick on semiconductor introduction ecl is a high performance technology that has been available for the designer since the 1960s. Logic families electronics sandeep kumar singh bca iind semester 2. The digital ics are designed using any of either bipolar devices or mos or a combination of both. Evaluation of logic families using nor and nand logic gates. Demonstrate an understanding of sequential logic 4. Logic families significance and types of logic families. Logic families are offered at every priceperformance node along with benchmark delivery, reliability, and worldwide support. Given this basic understanding of how these logic families work, we can set up a scenario in which each logic families fail. Some such logic families use static techniques to minimize design complexity.

Logic families and their characteristics 1 chapter 9. Digital logic families phys3360aep3630 lecture 26 these also have lower power requirements than the standard ttl these also have lower power requirements than the standard ttl these. In computer engineering, a logic family may refer to one of two related concepts. The simulation had been carried out at power supply voltage value of 3 v.

Logic families logic families are sets of chips that may implement different logical functions, but use the same type of transistors and voltage levels for logical levels and for the power supplies. Ti offers process technologies with the logic performance and features needed. When cmos logic is expected to drive ttl logic, the cmos gate may not have the current capability to drive the ttl gate. Tis goal is to help designers easily find the ideal logic technology or function they need. These families vary by speed, power consumption, cost, voltage. Internal temperature and voltage compensated bias network.

Introduction 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 a logic family may also refer to a set of techniques. Integration levels gatetransistor ratio is roughly 110 ssi between logic families. Ecl emitter coupled logic suitable for systems requiring highspeed operations mos metal oxide semiconductor logic. Interconnecting any two logic families often required special techniques such as additional pullup resistors, or purposebuilt 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. What is the definition of a ttl transistortransistor logic compatible signal.

The use of a single family within a circuit design with direct connections between ics enables circuit designers to produce circuits consisting mainly of ics, with few extra coupling or biasing components. Within each family, several subfamilies of logic types are available, with different. Each family has its own characteristics, limitations and advantages. Digital logic families electronics and communication engineering ece notes edurev notes for electronics and communication engineering ece is made by best teachers who have written some of the best books of electronics and communication engineering ece. Logic family 3 schottky ls, internal resistance values were increased to reduce power consumption and increase switching speed over the original version. 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. Over the years, the most widely used overall family has been the 7400 series ics. Digital logic families digital logic has evolved over the years and this process has led to the development of a variety of families of digital logic integrated circuits.

The emitter output requires a pull down resistor for current flow. Digital logic families phys3360aep3630 lecture 26 these also have lower power requirements than the standard ttl these also have lower power requirements than the standard ttl these also have lower power requirements than the standard ttl these also have lower power requirements than the standard ttl overview integration, moores law early families dl, rtl t. Diode logic dl diode logic dl is the most primitive of all the digital logic families. The time between the logic transition on an input and the corresponding logic transition on the output of the logic gate. Gowthami swarna, tutorials point india private limited. Previous gate questions on ic logic families with solutions 1987 till date. Comparison of digital logic families important for electronics dic paper mumbaiu b. The input gate is characterized by a multiemitter transistor. Many logic families were produced as individual components, each. Logic family 1 logic family in computer engineering, a logic family may refer to one of two related concepts. Different circuit configurations and production technologies are used during the production of digital integrated circuits.

May 11, 2018 different circuit configurations and production technologies are used during the production of digital integrated circuits. Hi there, im trying to do an assignment on interfacing between different logic families. Nov 28, 20 comparison of logic families using nand gate vibha soni1, nitin naiyar2 1, 2. We start with diode transistor logic which was one of the first logic families that were proposed. Comppggaring logic families major parameters for comparing logic families are the propagation delay, the power dissipation and the speedpower product. Ti maintains a firm commitment to remain in the market with both leadingedge and mature logic lines. Diodetransistor logic dtl emitter coupled logic ecl logic families can be classified broadly according to the technologies they are built with transistortransistor logic ttl cmos logic ttl and cmos logic family is most widely used ic technologies. Table 1 comparison of different logic families under nor and nand logic nor gate nand gate logic famili es powe r dela y powerdelay produ ct powe r delay powerdelay produ ct threshold rtl 6. Logic 1 and logic 0 are a bit more complex that 5v and 0v because these digital ics are really little analogue circuits posing as digital. The term transistortransistor is because both logic function and amplification is done by transis. D1 compare and contrast two different types of logic family with reference to five characteristics. If, for instance, we wished to use a singlepole, singlethrow spst switch as the input device for a ttl logic gate, what is the best way to connect such a device to a ttl input. It is a logic family consisting completely of transistors.