comparison of logic families

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. Logic suppliers have historically focused on speed and low power as the priori-ties for product family improvement. The transistor-transistor-logic (TTL) family was developed in the use of transistor switches for logical operations and defines the binary values as. 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. Table 1 Comparison of different logic families It can be observed from Table 1 that power dissipation in CMOS logic is least as compared to all the logic families. Logic Selection Guide How to use this guide The data on this page (page 2)give an historic overview of Fairchild’s available logic families. 0 V to 0.8 V = logic 0 2 V to 5 V = logic 1. (max) – The maximum voltage level at an output in the logical “0” state under defined load conditions. TTL Logic switching levels and a comparison of the different logic families. V. IH (min) – The minimum voltage required at an input to be recognized as “1” logical state. The power delay product which shows the figure of merit is least for CMOS technology and hence CMOS logic family outperforms all the logic families… CMOS generally consumes much less power, despite being more sensitive than TTL. For example, a certain amount of current is needed in order to operate correctly. Advantages of the TTL logic families include high switching speed (125 MHz), … Parameter TTL CMOS; Basic gate: NAND: INVERTER: Circuit: Transistor-Transistor: Complementary MOS: Speed of operation: More: Less: Propagation delay per gate: 4 - 12 ns Logic families are offered at every price/performance node along with benchmark delivery, reliability, and worldwide support. There have been many improvements in logical families such as TTL and CMOS. The digital ICs are designed using any of either bipolar devices or MOS or a combination of both. Characteristics of Digital IC: various logic families possess different characteristic, so one family may be best suited to one situation whereas another family in some other situation. TTL 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). Question: Problem 2 (6 Points) Read The Data Given In Table Below Comparison Of Logic Families Logic Family TTL Parameter 74 74H 74L 745 74AS 74ALS Basic Gate Fan Out Power Disspn. i.e, Metal Oxide Semiconductor. The logic gates (introduced in Module 2.1) are available in different combinations... 74 Series Device Identification. Home » DIGITAL ELECTRONICS » Comparison of logic families Comparison of logic families This entry was posted in DIGITAL ELECTRONICS on May 12, 2017 by nikhilarora In other words, the different 84-industrial. Title: Comparison of logic families using nand gate, Author: IJRET Editor, Name: Comparison of logic families using nand gate, Length: 4 pages, Page: 3, Published: 2013-11-28 Issuu company logo Issuu It is apparent that speed/power comparisons are not sufficient in themselves. V. IL (max) – The maximum voltage required at an input that still will be recognized as “0” logical state. Accordingly a variety of logic IC families spawned, each offering different capabilities and facilities. As compared to current ECL circuits, transistor-transistor logic uses low power but has simple design rules but it is significantly slower. The TTL logic family uses bipolar transistors to perform logic functions and CMOS uses field effect transistors. there has been a steady progression in technology; the design engineer now has a wide choice of integrated circuit ranges and operating parameters. ECE 410, Prof. A. Mason Advanced Digital.2 ECL is based on use of current steering switch realised using differential transistor pair. The 74LS (Low-power Schottky) family (like the original) uses TTL (Transistor-Transistor Logic) circuitry which is fast but requires more power than later families. Some families also have common characteristics. The circuit design of the basic gate of each logic family is the same. Digital Integrated circuits are produced using several different circuit configurations and production technologies.