1、Recognized as anAmerican National Standard (ANSI) Copyright 1986 byThe Institute of Electrical and Electronics Engineers, Inc.345 East 47th Street, New York, NY 10017, USANo part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the priorwritt
2、en permission of the publisher.IEEE Std 991-1986(R1994)IEE Standard for Logic Circuit DiagramsSponsorIEEE Standards Coordinating Committee 11onGraphic Symbols and DesignationsReaffirmed August 23, 1994Approved April 25, 1985American National Standards InstituteReaffirmed March 17, 1994Approved March
3、 21, 1985IEEE Standards BoardAcceptance NoticeThis non-Government document was adopted on 5 June, 1986, and is approved for use by the DoD. The indicatedindustry group has furnished the clearances required by existing regulations. Copies of the document are stocked byDoD Single Stock Points, US Nava
4、l Publications and Forms Center, Philadelphia, PA 19120, for issue to DoDactivities only. Contractors and industry groups must obtain copies directly from IEEE, 345 East 47th Street, NewYork, NY 10017.NOTICE: When reafrmation, amendment, revision, or cancellation of this standards is initially propo
5、sed, the industrygroup responsible for this standard shall inform the military coordinating activity of the proposed change and requestparticipation.Title of Document:IEEE Standard forLogic Circuit DiagramsDocument No:ANSI/IEEE Std 991-1986 Date of Specific Issue Adopted:27 June, 1986Releasing Indus
6、try Group:The Institute of Electrical and Electronics Engineers, Inc.Custodians: Military Coordination Activity:Army - AR Amry - ARNavy - SH Project DRPR-0260Air Force - 13Review Activities:Army - AV, MI, AM, CR, ERNavy - OS, ASAir Force - 11, 15, 17User Activities:Army - ATNavy - MCiiiIEEE Standard
7、s documents are developed within the Technical Committees of the IEEE Societies and the StandardsCoordinating Committees of the IEEE Standards Board. Members of the committees serve voluntarily and withoutcompensation. They are not necessarily members of the Institute. The standards developed within
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11、ll ofsome value, do not wholly reect the present state of the art. Users are cautioned to check to determine that they havethe latest edition of any IEEE Standard.Comments for revision of IEEE Standards are welcome from any interested party, regardless of membership afliationwith IEEE. Suggestions f
12、or changes in documents should be in the form of a proposed change of text, together withappropriate supporting comments.Interpretations: Occasionally questions may arise regarding the meaning of portions of standards as they relate tospecic applications. When the need for interpretations is brought
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14、e members of its technical committees are not able to provide an instant response to interpretation requestsexcept in those cases where the matter has previously received formal consideration.Comments on standards and requests for interpretations should be addressed to:Secretary, IEEE Standards Boar
15、d345 East 47th StreetNew York, NY 10017USAivForeword(This Foreword is not a part of ANSI/IEEE Std 991-1986, IEEE Standard for Logic Circuit Diagrams.)The contributors to this standard represent a broad range of institutions, technologies, and documentation needs. Theyinclude industrial, governmental
16、, and educational organizations, producers and consumers of devices and equipment,users and nonusers of computer-aided design and drafting, and a range of aesthetic preferences. That a consensus ofsuch diverse interests could be achieved in producing this standard is indicative of a need for a commo
17、n practice in thiseld.Work on this standard started in 1972, in an ad-hoc working group on Logic Diagrams, under the preparing group forY14.15, Electrical Diagrams. Work was suspended for several years while the International ElectrotechnicalCommission, Technical Committee 3 developed Publication 11
18、7, Part 7. to which the United States contributed. In1982 a new subcommittee was formed, operating as part of the IEEE Standards Coordinating Committee for GraphicSymbols and Designations, SCC 11. It decided to prepare a new draft incorporating:1) The 1975 draft of the original working group,2) IEC
19、Publication 113, Part 7. insofar as practical (in the present standard, some parts and illustrations are verysimilar to the IEC document; differences and additions result from new developments in symbols for logicfunctions and new perceptions of current needs), and3) Such parts of ANSI Y14.15-1968 (
20、R 1973) as applied to logic circuit diagrams, but with updating to removeduplication of requirements found in referenced standards and to apply the material explicitly to logic circuitdiagrams.After ten drafts the present document was completed and submitted to the IEEE Standards Board for approval.
21、The following persons were on the balloting committee that approved this document for submission to the IEEEStandards Board:Standards Coordinating Committee on Graphic Symbols and Designations, SCC 11R. B. Angus, JrJ. C. BrownG. A. KnappC. R. MullerJohn PeatmanJ. W. SeifertT. R. SmithS. V. SoanesR.
22、M. SternL. H. WarrenS. A. WassermanSubcommittee on Logic Circuit Diagrams, SCC 11.10T. R. Smith, Chair C. R. Muller, Acting SecretaryR. W. AndrewsR. B. Angus, JrJohn BalogR. R. BartaL. BurnsL. A. CiskowskiL. Davis *P. H. EnslowC. D. Fisher E. R. FlemingA. C. GannettJ. J. GeorgeA. HendryW. R. Holbroo
23、kG. A. KnappJ. A. KohlmeierJ. M. KreherF. A. MannD. MartinecJ. MassaroR. P. MayerJ. F. MorrongielloE. L. NesbittV. T. Rhyne M. R. RichterR. R. RitterJ. P. RussellR. SandigeL. E. SchulzR. M. SternR. D. StuartM. E. Taylor R. TobiasJ. VargoL. H. WarrenJ. WilliamsR. J. Yuhas* Liaison AFLC / MM APDLiaiso
24、n Y14 Resigned Liaison DoDvAt the time this standard was approved on March 21, 1985, the IEEE Standards Board had the following membership:John E. May, Chair John P. Riganati, Vice Chair Sava I. Sherr, Secretary James H. BeallFletcher J. BuckleyRene CastenschioldEdward ChelottiEdward J. CohenPaul G.
25、 CummingsDonald C. FleckensteinJay ForsterDaniel L. GoldbergKenneth D. HendrixIrvin N. Howell, JrJack KinnJoseph L. Koepfinger*Irving KolodnyDonald T. Michael*R. F. LawrenceLawrence V. McCallFrank L. RoseClifford O. SwansonJ. Richard WegerW. B. WilkensCharles J. Wylie*Member emeritusviCLAUSE PAGE1.
26、Introduction.11.1 Purpose. 11.2 Scope 12. Applicable Documents12.1 Industry Standards 12.2 Military Standards 22.3 International Standards 23. Definitions.34. General Requirements.44.1 Content . 44.2 Drawing Size and Format 44.3 Diagram Titles 54.4 Diagram Revisions. 54.5 Lettering . 54.6 Lines. 54.
27、7 Abbreviations . 64.8 Letter Symbols . 64.9 Layout and Presentation. 65. Logic Conventions and Polarity Indication 75.1 Relationship Between Logic States and Logic Levels. 75.2 Single Logic Convention . 85.3 Direct Polarity Indication. 86. Symbols for Devices and Functions96.1 Standard Symbols 96.2
28、 Size. 146.3 Orientation . 146.4 Application and Identification Information . 176.5 Inputs and Outputs with Multiple Functions 196.6 Abbreviated Representation of Symbols 216.7 Abutment of Symbols 236.8 Detached Representation of Symbols 236.9 Unused Terminals and Elements 246.10 Devices Having a La
29、rge Number of Terminals . 247. Interconnection of Symbols 257.1 General Requirements 257.2 Line Spacing 267.3 Junctions and Crossovers . 267.4 Interrupted Lines 277.5 Grouping of Lines 287.6 Polarity and Negation Matching 287.7 Power Connections 29viiCLAUSE PAGE8. Labeling of Connecting Lines.298.1
30、General . 298.2 Names for Logic and Analog Signals 298.3 Names for Power and Other Constant-Level Connections 378.4 Locator Information . 378.5 Additional Properties and Characterization . 389. Supplementary Information 389.1 Reference-Designation Accounting . 389.2 Diagram Notes . 389.3 Tabular Inf
31、ormation . 409.4 Waveforms . 409.5 Diagram Simplification and Abbreviation Techniques 4210. Examples of Logic Diagrams49Annex A Mnemonics for Use in Signal Names (Informative) .60Annex B Lines and Lettering Size and Spacing (Informative)72Annex C Single Orientation of Lettering (Informative) .82Copy
32、right 1986 IEEE All Rights Reserved1An American National StandardIEEE Standard for Logic Circuit Diagrams1. Introduction1.1 PurposeThe purpose of this standard is to provide standard practices and information for use in the preparation of diagramsdepicting logic functions.1.2 ScopeThis standard prov
33、ides guidelines for preparation of diagrams depicting logic functions. It includes denitions,requirements for assignment of logic levels, application of logic symbols, presentation techniques, and labelingrequirements with typical examples. The techniques are presented in the context of electrical/e
34、lectronic systems, butalso may be applied to nonelectrical systems (for example, pneumatic, hydraulic, or mechanical).2. Applicable Documents2.1 Industry StandardsThe latest editions of the following industry documents form a part of this standard to the extent specied herein:American National Stand
35、ardsANSI X3.4-1977, American National Standard Code for Information Interchange.1ANSI X3/TR-1-1983, American National Standard Dictionary for Information Processing.ANSI Y1.1-1972 (R 1984), American National Standard Abbreviations for Use on Drawings and In Text.1ANSI publications are available from
36、 the Sales Department, American National Standards Institute, 1430 Broadway, New York, NY 10018.2Copyright 1986 IEEE All Rights ReservedANSI/IEEE Std 991-1986 IEEE STANDARD FORANSI Y14.1-1980, American National Standard Drawing Sheet Size and Format.ANSI Y14.2M-1979, American National Standard Line
37、Conventions and Lettering.ANSI Y14.15-1966 (R 1973), American National Standard Electrical and Electronics Diagrams (includesSupplements ANSI Y14.15a-1971 and ANSI Y14.15b-1973 ).ANSI/IEEE Std 91-1984, IEEE Standard Graphic Symbols for Logic Functions.2ANSI/IEEE Std 100-1984, IEEE Standard Dictionar
38、y of Electrical and Electronics Terms.ANSI/IEEE Std 194-1977, IEEE Standard Pulse Terms and Denitions.ANSI/IEEE Std 200-1975, IEEE Standard Reference Designations for Electrical and Electronics Parts and Equipment.ANSI/IEEE Std 260-1978 (R 1985), IEEE Standard Letter Symbols for Units of Measurement
39、 (SI Units, CustomaryInch-Pound Units, and Certain Other Units).ANSI/IEEE Std 280-1985, IEEE Standard Letter Symbols for Quantities Used in Electrical Science and ElectricalEngineering.ANSI/IEEE Std 315-1975, Graphic Symbols for Electrical and Electronics Diagrams (Including ReferenceDesignation Cla
40、ss Designation Letters).2.2 Military StandardsThe latest edition of the following Department of Defense document forms a part of this standard to the extentspecied herein and shall be used for DoD contracts in place of the equivalent Industry Standards listed above:MIL-STD-12, Military Standard Abbr
41、eviations for Use on Drawings, Specications, Standards, and in TechnicalDocuments.32.3 International StandardsThis standard is compatible (except as noted) with the following publications:IEC Publication 113 (1971 - 1983), Diagrams, Charts, Tables.4ISO 31/1-1978, Quantities and Units of Space and Ti
42、me.5ISO 646-1983, 7-bit Coded Character Set for Information Processing Interchange.2IEEE publications are available from IEEE Service Center, 445 Hoes Lane, Piscataway, NJ 08854.3MIL publications are available from Superintendent of Documents, US Government Printing Office, Washington, DC 20402.4IEC
43、 publications are available in the United States from the Sales Department, American National Standards Institute, 1430 Broadway, New York,NY 10018, USA. The IEC publications are also available from International Electrotechnical Commission, 3, rue de Varemb, Case postale 131,1211Genve 20, Switzerla
44、nd/Suisse.5ISO publications are available in the United States from the Sales Department, American National Standards Institute, 1430 Broadway, New York,NY 10018, USA. ISO publications are also available from the ISO Office, 1, rue de Varemb, Case postale 56, CH-1211, Genve 20, Switzerland/Suisse.Co
45、pyright 1986 IEEE All Rights Reserved3LOGIC CIRCUIT DIAGRAMS ANSI/IEEE Std 991-19863. DefinitionsThe following denitions are for use with this standard. For other use and for denitions not contained herein, seeANSI/IEEE Std 100-1984 .6graphic symbol: A gure, mark, or character conventionally used on
46、 a diagram, document, or other display torepresent an item or a concept.logic symbol: A graphic symbol that represents a logic function.qualifying symbol: A graphic symbol added to another to provide additional information. For a logic element, agraphic symbol added to the basic outline to designate
47、 the overall logic characteristics of the element or the physicalor logic characteristics of an input or output of the element.negation bar: A line over a signal label that indicates logic inversion of that signal.element: As used within this standard, a representation of all or part of a function w
48、ithin a single outline, which may,in turn, be subdivided into smaller elements representing subfunctions of the overall function. Alternatively, thefunction so represented.logic circuit diagram: A circuit diagram that predominantly uses symbols for logic functions to depict the overallfunction of a
49、circuit.basic logic diagram: A logic circuit diagram that depicts, in simple form, the intended function of a circuit. It doesnot necessarily contain constructional or engineering information, nor does it represent exactly the nal physicalform.detailed logic diagram: A logic circuit diagram that depicts, in detail, a circuit as actually implemented. It containsinformation that can be used for manufacturing or maintenance purposes, but it does not necessarily includeengineering information that is not concerned with logic functions.logic state:
