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Topic: Logic families


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 Digital Logic Families Part-I
Logic families can be classified broadly according to the technologies they are built with.
Logic levels are the voltage levels for logic high and logic low.
The time between the logic transition on an input and the corresponding logic transition on the output of the logic gate.
www.asic-world.com /digital/logic1.html   (1291 words)

  
 chet_tocci_electech_9|Integrated-Circuit Logic Families|Glossary
Current-Sinking LogicLogic family in which the output of a logic circuit sinks current from the input of the logic circuit that it is driving.
Current-Sourcing LogicLogic family in which the output of a logic circuit sources, or supplies, current to the input of the logic circuit that it is driving.
Logic Function Generation — Implementation of a logic function directly from a truth table by means of a digital IC such as a multiplexer.
wps.prenhall.com /chet_tocci_electech_9/0,8396,1039691-,00.html   (9855 words)

  
 Logic families
Logic families are groups of logic circuits that are based on particular types of elements (resistors, transistors, and so forth).
Families are identified by the manner in which the elements are connected, and, in some cases, by the types of elements used.
As mentioned before, logic families are identified by the elements used and the manner in which the elements are used.
www.tpub.com /neets/book13/55k.htm   (602 words)

  
 High-Speed Digital I/O Logic Families- Developer Zone - National Instruments   (Site not responding. Last check: 2007-11-04)
Logic families are groups of logic circuits with standardized voltage levels that constitute a voltage high or low level.
Single-ended logic families use standardized single-ended voltage levels to interpret the voltage swing between the voltage driven by the device and
Differential logic families use differential voltage levels to measure the voltage difference between a pair of wires.
zone.ni.com /devzone/cda/tut/p/id/3406   (785 words)

  
 Diode logic - Wikipedia, the free encyclopedia
Diode logic is a logic family that makes use of diodes to construct logic gates for Boolean logic circuits.
Whenever a logic 1 is present at the anode of a diode, it forward-biases that diode, causing it to conduct.
If a logic 1 is present at the cathode of every diode, then they are all unbiased (voltage equal to the source voltage) or reverse-biased (voltage higher than source voltage), remaining in a high-impedance state, and node 1 is held high by the power supply through R1.
en.wikipedia.org /wiki/Diode_logic   (352 words)

  
 NJIT - ECE 394 Digital Systems Laboratory - Experiment No.1: Logic Gates and Logic Families
Digital IC gates are classified not only by their logic operation, but also the specific logic-circuit family to which they belong.
Each logic family has its own basic electronic circuit upon which more complex digital circuits and functions are developed.
Suppose logic 0 is 0V and logic 1 is 5V, ideally.
coefs2.njit.edu /ECE394/ECE394-I.htm   (1250 words)

  
 Logic family - Wikipedia, the free encyclopedia
In computer engineering, 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.
Many logic families were produced as individual components, each containing one or a few related basic logical functions, which could be used as "building-blocks" to create systems or as so-called "glue" to interconnect more complex integrated circuits.
Other logic families were essentially only used to produce large scale integrated circuits such as a central processor, memory, or other complex function.
en.wikipedia.org /wiki/Logic_families   (1719 words)

  
 Motorola Logic Families which_isbest.html
When a logic designer is faced with developing a new product requiring performance significantly different from the past, it might be well to examine various logic family alternatives.
The new LCX family is one outgrowth of this trend.
All advanced logic family versions have significantly increased drive capacity, and several (FACT, LCX and all ECL) are capable of driving 50 ohm transmission lines directly.
design.stanford.edu /spdl/ME218a/logic/which_is_best.html   (2010 words)

  
 22C:122/55:132, Lecture 2, Spring 2004
Some families are fully compatable with each other, others marginally compatable so long as there is not much noise and loads are minimized, and some logic families require special conversion circuitry.
The unit load of a standard input in that logic family is one, and the maximum fanout of a standard output in that logic family is the number of unit loads that may be connected to a single output.
In practice, it is common to talk about positive logic, in which the "asserted" state is represented by a high signal (nominal +5 in TTL logic) and negative logic, in which the "asserted" state is represented by a low signal (nominal 0 in TTL).
www.cs.uiowa.edu /~jones/arch/notes/02logic.html   (3121 words)

  
 Logic Family
With about 20 logic families now extant, some comments are in order about which to use for teaching lab excercises and projects.
When a design has to mix logic families, some care may be indicated as per the interconnection guidelines in Horowitz and Hill Table 9.2.
Logic medium speed, high drive, 5 V VCC 74F logic is a general-purpose family of high-speed advanced bipolar logic.
www.piclist.com /techref/logic/family.htm   (1799 words)

  
 Pericom - Frequently Asked Questions (FAQs) - By Product Family: Specialty Interface
There are two approaches to obtain the output impedance of a Logic driver: Extract the R-on from the V-I data in the IBIS model (available on the web), which is preferred because it is faster and easier; Or register/login to the website to obtain technical assistance.
Yes, a logic driver can tolerate heavy undershoot with short duration because there is an ESD diode between the input or output of the driver and ground in reversal direction.
For many of Pericom's logic drivers, buffers and inverters, it is allowed to shorten a few of the output pins in order to increase the driver strength for heavy resistive or capacitive load, but the maximum current and power consumption must meet the spec of the logic device.
www.pericom.com /faq/faq_family.php?family=1   (3855 words)

  
 When Logic Switches Too Fast
Not long ago, the major TTL logic families all had typical rise and fall times that, by modern standards, were very slow--on the order of 10 ns.
Modern vanilla-bean logic families have rise and fall times on the order of 1 ns or less.
Over the years, as logic outputs have continued to switch faster and faster, problems with ringing and crosstalk have gotten progressively worse.
www.sigcon.com /Pubs/straight/logswtch.htm   (489 words)

  
 Inside Logic Gates
[Diode Logic (DL)] [Resistor-Transistor Logic (RTL)] [Diode-Transistor Logic (DTL)]
Most logic families share a common characteristic: their inputs require a certain amount of current in order to operate correctly.
If for any reason you need to interface between two different logic families, be careful to note and meet the drive requirements and limitations of both families, within the interface circuitry.
www.play-hookey.com /digital/electronics   (932 words)

  
 [No title]
In order to be used with other logic circuits, a circuit element such as an inverter must recognize certain voltages at its input as LO and others as HI, and must produce a predictable output voltage level whenever a valid logic LO or HI is present at its input.
Any time a logic family is connected at its inputs or outputs to either another family or to other devices, you must insure that the interface between the circuits will transmit HI and LO logic levels faithfully and with adequate safety margins, so that the voltages never enter the unallowed regions.
Logic Families TTL The very earliest digital integrated circuits (circa 1960) used a type of logic known as RTL, for resistor-transistor logic.
www.txstate.edu /Technology/nsf/10-LogicFamsandInterfaces.doc   (4470 words)

  
 IDT Expands High-Performance Logic Families to Offer Industry's Most Complete Product Line | IDT
For high-density design capabilities, the high-speed logic families include bus interface functions such as buffers, line drivers, switches, transceivers, flip-flops, latches, gates and multiplexers/demultiplexers.
The LVC family’s capability for "hot insertion" allows designers the ease to interface different logic switching levels, such that LVC devices can be used as both a unidirectional and bi-directional level translator.
Walker added, "The PicoGate logic devices we have introduced might appear to be out of place in this age of function integration, but today’s designers cannot afford the clock delay impact required to collect fixes in an ASIC, FPGA or multi-bit logic function somewhere else on their board.
www.idt.com /?id=639   (977 words)

  
 IC Logic Level Translation Description
A (10124) TTL to ECL translator is used to switch between the two logic families.
A (10125) ECL to TTL translator is used to switch between the two logic families.
A (10350) PECL to TTL translator is used to switch between the two logic families.
www.interfacebus.com /Design_Translation.html   (870 words)

  
 Digital Logic
Using this two-valued logic system, every statement or condition must be either "true" or "false;" it cannot be partly true and partly false.
One essential reason for basing logical operations on the binary number system is that it is easy to design simple, stable electronic circuits that can switch back and forth between two clearly-defined states, with no ambiguity attached.
Digital logic may be divided into two classes: combinational logic, in which the logical outputs are determined by the logical function being performed and the logical input states at that particular moment; and sequential logic, in which the outputs also depend on the prior states of those outputs.
www.play-hookey.com /digital   (645 words)

  
 IC Glue Logic Family Descriptions
There are additional signaling types; however, many do not exist as a logic family.
In general, none of the logic families listed above will operate with any other logic family, the voltage thresholds are different for each logic family.
Logic Family Voltage Translation page for interfacing techniques between logic families.
www.interfacebus.com /logic_table.html   (312 words)

  
 LSI Logic : About LSI : Press Room : Media Resources : News Releases : 20030721pr
The Xtreme family is optimized for high performance, high-bandwidth, market specific applications such as communications, storage and computing.
While the Integrator family also targets these markets, it is additionally suited for uses in consumer electronics, industrial, security, instrumentation, imaging and others.
Both families use 0.11-micron process technology and build upon the RapidChip value proposition, providing designers with fast, predictable and affordable custom logic solutions.
www.lsilogic.com /news/product_news/2003_07_21.html   (277 words)

  
 [No title]   (Site not responding. Last check: 2007-11-04)
In a narrow sense a logic family is a set of small and medium-scale integrated circuits, fabricated from a common process, which span the range of gates and flip flops that a logic designer may find useful in assembling a large digital system.
TTL was not the first logic family, but by the late 60's chips in the 7400 series had a combination of shorter propagation delay and lower power consumption, compared to the now obsolete families of diode logic, resistor-transistor logic, and diode-transistor logic.
Random logic, picked by an engineer to optimize a particular design, is now being replaced by standard gate arrays, which have more in common with systematic memory organizations than with Karnaugh-map and excitation map minimized designs.
www.engin.brown.edu /faculty/daniels/ddzo/speed.html   (5399 words)

  
 LOGIC FAMILIES
Logic families are groups of logic circuits that are based on particular types of elements (resistors,
Families are identified by the manner in which the elements are connected, and,
Logic circuits are usually manufactured as integrated circuits and packaged in dual-inline packages
www.tpub.com /content/neets/14185/css/14185_156.htm   (287 words)

  
 NXP Semiconductors - Logic [Support - Frequently Asked Questions (FAQ)]
What is the logic state of the bus hold input while a device powers up?
Bus hold is built in on the LVT, LVT16, and ALVT families.
Bus hold is optional on the ABT16, LVC, LVC16, ALVC, and AVC families.
www.standardics.nxp.com /support/faq/logic   (670 words)

  
 Glue Logic IC Family Selection Guide
All types of Glue Logic families are still in mass production, but a number of families may soon be obsolete.
Given the list of possible glue logic families; the first step in selecting a logic family to use is based on weather or not you are producing a new design or working on a previous design.
Glue logic families will normally be selected by the speed at which they switch [operate at], or by the power they consume.
www.interfacebus.com /Design_Logic_Family_Selection.html   (1300 words)

  
 Logic Families
The types of logic devices are classified in "families", of which the most important are TTL and CMOS.
Integrated circuits in the TTL logic family have part numbers which are four to five digit numbers.
With the introduction of other types of construction of devices, letters were added to center of the numbers to remind the user that basic TTL chips are not being used.
hyperphysics.phy-astr.gsu.edu /hbase/electronic/logfam.html   (340 words)

  
 Digital Logic Gates Part-IV
Logic families can be classified broadly according to the technologies they are built using.
MOS: Metal Oxide Semiconductor Logic (PMOS and NMOS).
Of this, only CMOS is most widely used by the ASIC (Chip) designers, we will still try to understand few of the extinct technologies and lesser used technologies.
www.asic-world.com /digital/gates4.html   (1262 words)

  
 Innovative Technologies in Education
The EB-220 is a single board comprehensive instructional module designed to teach basic concepts of Logic Families to technology students.
The boards also come equipped with "fl boxes" containing components used in the fault-finding and practice modes, components that should not be visually identified by the trainee.
Examine how gates belonging to different families may be combined.
www.iteltd.com /acatalog/ITE_Products_EB_220_Logic_Families_50.html   (352 words)

  
 IDT Introduces Industry's Highest-Performance 3.3- Volt Bus Interface Logic Families | IDT
``High-performance logic is critical to their success, and we're pleased to provide them with the fastest devices available in the industry.
Complementing the ALVC family is the LVC family, offering a 4.1 ns propagation delay for 3-volt designs that need to interface with 5-volt systems.
The LVC family's capability for ``hot insertion'' allows designers the ease to interface different logic switching levels, such that LVC devices can be used both as a unidirectional and bidirectional level translator.
www.idt.com /?id=635   (862 words)

  
 High-Speed Logic Leaders IDT and TI Join Forces to Standardize 3.3-Volt Logic | IDT
The LVC family is a 5-volt tolerant, 3.3-volt family with maximum propagation delays of 4.0 ns.
The ALVC family is a 3.3-volt family designed to optimize speeds, and touts a rapid 3.0 ns maximum propagation delay.
The families include multiple functions, including buffers, registers, latches and transceivers with a variety of input and output configurations.
www.idt.com /?id=636   (934 words)

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