Lab manual for logic families ttl and ecl

Manual logic families

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A1: ECL stands for Emitter Coupled Logic. The design of ECL consists of termination resistors which allows the signals to propagate with very low reflection. Some of these are still in use today. List the advantages of ECL as compared to TTL logic family. They deliver speed and drive on a par with TTL, quashing worries about high-speed systems built with CMOS alone. 7400) is obsolete • Newer TTL families still used (e. This document describes the main logic families and their characteristics.

ECL is fastest logic family among all and this is due to. Three families of CMOS logic are reported. It implies that the gate can supply the current to _______ of same family.

Diode Logic (DL) 2. This now offers the opportunity of using mixed CMOS and TTL families at various power levels for logic operations and interfacing with ECL for high frequency digital communications. Emitter Coupled Logic (ECL) or Current Mode Logic (CML) 6. All chips in the TTL logic family have the following specifications: • POWER SUPPLIES: +5 V and Ground (0 V). families are the most frequently used. Logic Families in Digital Electronics - TTL, CMOS, and ECL Most electronic systems which are responsible for modern advances are based on digital technology. Define power dissipation? Compare the performance of T T L C M O S, E C L families CM 305.

That the transistor T 2 (or T 1 ) is indeed in logic 0 may now be computed by considering the fact that with V A, the voltage at point A = −1. Bipolar Transistor- Transistor Logic (TTL) • first introduced by in 1964 (Texas Instruments) • TTL has shaped digital technology in many ways • Standard TTL family (e. Define noise margin. The basic circuit configuration consists of a pair of NPN transistors with their emitters connected together and lab manual for logic families ttl and ecl fed by a current source as show in.

General Characteristics of Basic Logic Families • CMOS consumes very little power, has excellent noise immunity, and is used with a wide range of voltages. (Electronics Lab) EXPERIMENT NO – 01 TITLE OF THE EXPERIMENT: Verify four voltage and current parameters for TTL and CMOS (IC 74LSXX, 74HCXX). ECL was first introduced in 1962. The storage time is eliminated as the transistors are used in difference amplifier mode and are never driven into saturation.

Saturation in ECL is avoided by using the BJT differential pair as a current switch. ECL III : Emitter coupled. Different Gate’s are constructed using Integrated circuits. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Digital Logic Families 1) Suppose that the digital IC family has a fan out of 6. . Which is faster TTL or ECL?

TTL and ECL are based upon bipolar transistors. • ECL – emitter coupled logic based on bipolar transistors. ECL is based on use of current steering switch realised using differential transistor pair. The CMOS–TTL logic level problem. 16a on page 172). • LOGIC HIGH: 2. The different logic families are: RTL(Resistor Transistor Logic) DTL(Diode Transistor Logic) TTL(Transistor-Transistor Logic) ECL(Emitter Coupled Logic) CMOS(Complementary Metal. • TTL can drive more current and uses more power than CMOS.

0 to 5 V • LOGIC LOW: 0 to 0. Complete the table below by writing the expanded names of the three most popular logic families. Interconnecting any two logic families often required special techniques such as additional pull-up resistors, or 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. This has changed with the introduction of PECL (Positive ECL) using a +5V supply, and LVPECL (Low Voltage Positive ECL) using a +3. 74ALS00) Distinct features • Multi-emitter transistors • Totem-pole transistor arrangement. Interfacing Logic Families. Experiment 8: Metal Oxide Semiconductor Field Effect Transistor ( MOSFET manual ). Experiment 3: TTL and ECL Logic Gates Prelab Ubaid Haroon Lab Session: Friday 8:40 - 11:40 am Lab Date: 8th March, Activity 1: Circuit.

• ECL is fast, with poor noise immunity and high power. It was soon superseded by the later TTL logic technology. Which is the most commonly used logic family a. TTL has a well-established popularity among logic families. Its name signifies that transistors perform both the logic function (the first "transistor") and the amplifying function (the second "transistor"), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL).

• VLSI design is difficult as ECL gates require resistors also. Transistor- Transistor Logic (TTL) 5. The most widely used families are: DL (Diode- logic). (a) ECL which has a propagation delay at 2ns. ECL is used only in systems requiring high. Experiment 5: Diode-Transistor Logic (DTL) Gates.

5 The BJT differential pair was studied in Chapter 9, and we urge the reader to review the introduction given in Section 9. Level Shifting ; Level-shifter ICs 4049B and 4050B; 43. This logic family bypasses TTL in terms of speed. The 74xx families are shown above, but the 54xx families also applies.

List the specification of C MOS logic families. TTL - the basic TTL inverter given in the Gopalan text (Figure 4. 48 Interfacing Logic Families. A) Bipolar Families: 1. MOS and CMOS, are based on field effect transistors. Which requires more power to operate? Classify the logic family by operation. The basic circuit configuration consists of a pair of NPN transistors with their emitters connected together and fed by a current source as show in Fig.

Experiment 10: CMOS Logic. 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 fan-out,power consumption,noise immunity etc. However, this logic works with negative power supplies and does dissipate more power than other logic families. The following logic families are the most frequently used. Disadvantages of ECL Gates • Very low noise-margin (± 200 mV). Is the fastest logic family and has the lowest propagation delay.

Although _____ (CMOS/ECL/TTL) devices are fastest, however they have not been very. • Capacitive loading limits fan out. Write the classification of logic families. This is the logic-0 level of the ECL gate. The logic family refers to the general physical realization of a logical element, such as the TTL, emitter-coupled logic (ECL), or complementary metal-oxide semiconductor (CMOS) logic families. Within each logic family are one or more logic series that have distinctive characteristics, relative to other series within the same logic family. The chips or packages that will be used to build the experiments belong to the TTL logic family, and they are referred as the 74LSXX family, where the XX is a number that indicates the specific kind of gate or function. 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.

Standard TTL series of logic families starts with 7404,74586 &74ALs161; The other two families are for military and industrial application. Experiment 4: Resistor-Transistor Logic (RTL) Gates. ECL is used only in systems requiring high-speed operation. TTL Transistor-transistor logic ECL Emitter-coupled logic MOS Metal-oxide semiconductor CMOS Complementary metal-oxide semiconductor TTL and ECL are based upon bipolar transistors.

All of these technologies were developed in the 1950s/1960s and evolved over time. MECL I : Emitter coupled logic -5. In Emitter Coupled Logic (ECL), 1.

1 The Basic Principle Emitter-coupled logic is based on the use of the current-steering. The logic families swe. ECL- Emitter Coupled Logic. 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. families are the most frequently used. Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Experiment 9: N-MOSFET Logic Gates. Worse-case values ; See Table 9-4 in your text.

It is an old technology and the speed is due to the fact that the transistors never enter saturation -- so there is no time to wait for the transistor to come out of saturation. Experiment 7: Emitter Coupled Logic (ECL) Gates. The main characteristics for some typical logic gates packages are shown in Figures. • ECL gates cost more than that of TTL gates. TTL Logic In this experiment, we will be using TTL logic.

Digital logic circuits are manufactured depending on the specific circuit technology or logic families. Notice that in the logic- 0 level, all the transistors operate in their active region rather than in cut-off and saturation. This is a listing of TTL, ECL and CMOS Glue Logic Families, with a short description of how they differ from one another. TTL to CMOS ; Pull-up resistor ; 39. - TTL Packages Description. . Integrated Injection Logic (IIL) B) MOS Families: 1. 2 before proceeding with the study of ECL.

They are widely used in large scale integrated circuits because of their high component density and relatively low power. 4: Modern Microprocessors use _____ (CMOS/TTL) logic family. 50 Interfacing Logic Families. 47 Interfacing Logic Families. ECL logic families require large currents, therefore, power dissipation is 3 to 10 times higher ecl than that of TTL logic families. ECL is also a non-saturated logic. Among the technologies discussed here are DL, RTL, DTL, ECL, TTL, CMOS and BiCMOS. View Notes - Pre Lab 3 from ECE 363 at Rutgers University.

ECL Emitter-coupled logic Fastest available logic family Consumes more power than CMOS. • Highest power lab manual for logic families ttl and ecl dissipation among all logic gates. All digital systems, computers and microprocessors are assembled from simple circuits called logic circuits.

TTL stands for Transistor Transistor Logic, CMOS lab manual for logic families ttl and ecl stands for Complementary Metal Oxide Semiconductor and ECL stands for Emitter Coupled Logic. Classify the basic families that belong to the bipolar families and to the MOS families. TTL has a well established popularity among logic families. 5 V and V X = –1. The logic levels for ECL are normally -0.

TTL and CMOS are two of the most common logic families. 49 Interfacing Logic Families. Because of its large power consumption and high requirement of silicon area, CMOS logic lab manual for logic families ttl and ecl gates are preferred over ECL logic families in large scale integrated circuits. These families vary by speed, power consumption, cost, voltage & current levels.

Resistor Transistor Logic (RTL) 3. Fill in the banks of the statements below concerning the following logic families: Standard TTL (74 XXXLL), Low power TTL (74LXX) Low power Schottky TTL (74L SXX), Schottky TTL (74 SXX), Emitter coupled logic (ECL), CMOS a. Experiment 6: Transistor-Transistor Logic (TTL) Gates. List the specification of T T L and ECL logical families.

Lab manual for logic families ttl and ecl

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