Ecl logic design pdf

Combine members of the new groups to create more new groups combined terms must differ by one. Ti assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. In digital logic design only two voltage levels or states are allowed and these states are generally. Ecl was the first type of logic ic family to be developed and it appeared around 1962. Give the truth table for exnor and realize using nand gates.

Within each family, several subfamilies of logic types are. The digital logic gate is the basic building block from which all digital electronic circuits and microprocessor based systems are constructed from. Ecl design principles chapter 3 ecl design principles this chapter is an introduction to general and synergyspeci. Mos metal oxide semiconductor field effect transistors. Continued calculating the power dissipation in an, support ecl and pecl logic levels. Emittercoupled logic ecl3 supplementary material to accompany digital design principles and practices, fourth edition, by john f. The max9691max9692max9693 are ultrafast ecl comparators capable of very short propagation delays. The current texas instruments serial gigabit solution device that has an integrated lvpecl driver is the tnete2201 device. Afaik logic ecl threshold levels are something weird nowadays hard to interface with other logic family.

Yet more quinemcclusky each member of a group must have xs in the same position. Digital logic design is foundational to the fields of electrical engineering and computer engineering. Basic ecl inverter concept design so q 1 active, q 2 off when v in high, opposite w v in low determine logic levels next differential ampli. Some are defined by industry standard committees, such as the tia, ieee, or jedec groups. F100k ecl 300 series databook and design guide datasheet. The propagation group ecl design guide 3 introduction emittercoupled logic ecl ics are ideal for operating in the gigahertz range due to their picosecond propagation delays.

Synergys ecl logic design is based on the ornor gate, shown in fig ure 47. To get familiar with this logic, lets examine an ecl inverterbuffer as shown in figure 1. The dtl logic family or series used diodes on the inputs to create functions such as and and or and then had transistors on the output. Fred zlotnick on semiconductor introduction ecl is a high performance technology that has been available for the designer since the 1960s. Nov 20, 2014 looking for a hard to find data sheet for an obscure component. In ecl technology a logic 0 is defined as having a larger negative voltage than a logic 1. The 907 ecl card is available as a standalone card or as a cwdm stacking version for integration with a 907 multiplexer or other devices. This is a noror gate using emittercoupled logic, a highspeed type of logic using transistors. Emittercoupled logic is a highspeed bipolar logic family. Logic family 2 circuits applications such as cpus and memory chips which fall outside of the scope of this article. In electronics, emittercoupled logic ecl is a highspeed integrated circuit bipolar transistor logic family. Emittercoupled logic ecl is understood by most computer designers to be the fastest stuff available, which it is and as too difficult for anyone but the largest companies to design with, which it isnt.

Ttl evolution schottky series 74ls00 ttl a major slowdown factor in bjts is due to transistors going inout of saturation shottky diode has a lower forward bias 0. These characteristics may involve power, current, logical function, protocol and user input. It was soon superseded by the later ttl logic technology. Others are more vendor specific flavors and may have unique electrical characteristics all. One of the most popular and widely used types of logic gates made of transistors is called the emittercoupled logic or ecl. It comprehensively covers all the basics of digital electronics, its logic and design. Circuit architecture emitter coupled logic ecl is a nonsaturating form of digital bipolar circuit architecture. Dandamudi for the book, fundamentals of computer organization and design. Ttl transistortransistor logic ecl emittercoupled logic mos metaloxide semiconductor cmos complementary metaloxide semiconductor ttl and ecl are based upon bipolar transistors. Realize the ex or gates using minimum number of nand gates. It provides a foundation for the next two chapters. Ecl uses an overdriven bjt differential amplifier with singleended input and limited emitter current to avoid the saturated fully on region of operation and its slow turnoff behavior. Singledual, ultrafast, ecloutput comparators with latch enable. Logic done in emitter circuitry rather than collector.

The max9691max9692max9693 have differential inputs and complementary outputs that are fully compatible with ecl logic levels. Ecl designs used 2 or 3 voltage levels, which had to be pretty constant, where a ttl would work at 6v an it would work at 4v. Ecl logic has the capability of significantly reducing the clock skew of a system over an equivalent design utilizing cmos or ttl technologies. Still cannot find it after doing an extensive search on the web. It has always been at least an order of magnitude better in propagation delay and skew when compared with cmos and ttl logic. In order to minimize risks associated with the customers applications, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards. The ecl logic stopped competing with ttl in design considerations in the latter half of 1980s, and even before it was a questionable design choice. Jan 15, 2016 does anybody still design with ecl logic. Firstly, the circuit inside the dotted box is a voltage reference circuit providing a reference voltage at the base of t2. It makes use of a transistorbased differential amplifier to amplify and combine digital signals.

Usually, these circuits or gates, as they are commonly known, have multiple. Interfacing between lvpecl, vml, cml and lvds levels. Thus ecl logic operating from, required for logic operation. Digital logic design bibasics combinational circuits sequential circuits pujen cheng adapted from the slides prepared by s. Interfacing between lvpecl, vml, cml, and lvds levels 5 3. Basic digital logic gates perform logical operations of and, or and not on binary numbers. Their design maintains the excellent dc matching characteristics normally found only in slower comparators. Internal comparator circuit design optimal ecl internal logic swing standard vbbbasedinternal comparator common mode vbbbasedinternal comparator vrlbasedinternal comparator look outputdriverdesign diode stacking considerations circuit design optimization conclusions look outputtemperature compensation ecl look voh and dvohdt equations. Compare with cmos, bjts are not easy to implement in microelectronics. Jan 16, 2020 dtl ttl ecl mos cmos pdf evolution of ttl family. Resistortransistor logic rtl 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. Our design created voltages at nodes 11 and 20 which exceeded the required 0. May 26, 2015 when multiple digital signals have to be combined, engineers use several types of logic gates.

The skew introduced by a logic device can be broken up into three areas. Emitter coupled logic media converter model 907 ecl sonar focal technologies corporation, a moog inc. What are the logic low and high levels of ttl ics and cmos ics. High speed paths are typically implemented within deep submicron cmos integrated circuits. If either one of them is high 700 mv, then the or output is high, and the nor output is low. And8059d a comparison of lvds, cmos, and ecl prepared by. Lvds, cml, ecldifferential interfaces with odd voltages. What is mecl 10h or 100 k ecl logic levels and how do i use. We were able to design a translation buffer that successfully provided an interface from ecl to cmos. The basics of emittercoupled logic technical articles. Additionally, thanks to their use of differential inputs, they are able to drive long transmission lines in relatively noisy environments. The design of ecl consists of termination resistors which allows the signals to propagate with very low reflection.

Digital logic designers build complex electronic components that use both electrical and computational characteristics. Lvds, cml, ecldifferential interfaces with odd voltages by john goldie, applications manager there are many differential signaling technologies available today. F100k ecl 300 series and design guide f100k ecl 300 series databook and design guide clc018 text. Feb 23, 2015 emittercoupled logic ecl based on bipolar transistors, but removes problems of storage time by preventing the transistors from saturating very fast operation propagation delays of 1ns or less high power consumption, perhaps 60 mwgate low noise immunity of about 0. This book is designed to meet the syllabus requirement of the b. To design and set up the following circuit using ic 7483. Please refer to section seven of the f100k ecl logic databook and design, diodes on the inputs and outputs. Presentday building block logic gate ics are based on the ecl, ttl, cmos, and bicmos families.