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ANSI/IEEE Std 91-1984
IEEE Standard Graphic Symbols for
Logic Functions
(Including and incorporating IEEE Std 91a-1991, Supplement to IEEE
Standard Graphic Symbols for Logic Functions)
Sponsor
IEEE Standards Coordinating Committee 11,
Graphic Symbols and Designations
ANSI/IEEE Std 91-1984
Approved 17 September 1981, IEEE Standards Board
Approved 26 October 1982, American National Standards Institute
Adopted for Mandatory Use 10 May 1984 Adopted U.S. Department of Defense (DoD)
ANSI/IEEE Std 91a-1991
Approved 27 June 1991 IEEE Standards Board
Approved 3 June 1994 American National Standards Institute
Adopted for Mandatory Use 1 July 1991 U.S. Department of Defense (DoD)
Abstract:
Graphic symbols for representing logic functions or physical devices capable of carrying out logic
functions are presented. Descriptions of logic functions, the graphic representation of these functions, and
examples of their applications are provided. The symbols are presented in the context of electrical
applications, but most may also be applied to nonelectrical systems (for example, pneumatic, hydraulic, or
mechanical). The supplement provided additional internationally approved graphic symbols and made
corrections as needed to IEEE Std 91-1984.
Keywords:
dependency notation, industry standards, logic diagrams, logic function, logic symbols, military
standards
The Institute of Electrical and Electronics Engineers, Inc.
345 East 47th Street, New York, NY 10017-2394, USA
Copyright © 1996 by the Institute of Electrical and Electronics Engineers, Inc.
All rights reserved. Published 1996. Printed in the United States of America
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the
prior written permission of the publisher.
ANSI/IEEE Std 91a-1991
Recognized as an
American National Standard (ANSI)
ANSI/IEEE Std 91-1984
10 May 1984
(Superseding
ANSI Y32.14-1973
IEEE Std 91-1973)
Acceptance Notice
This non-government document was adopted on 10 May 1984, and is approved for use by the Department of Defense
(DoD). The IEEE has furnished the clearances required by existing regulations. Copies of the document are stocked at
the Standardization Documents Order Desk, Bldg 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094 for issue to
DoD activities only. Other Government activities, contractors, private concerns, or other requestors must obtain the
document from:
The Institute of Electrical and Electronics Engineers, Inc.
345 East 47th Street
New York, NY 10017-2394 USA
Title of Document:
IEEE Standard Graphic Symbols for Logic
Functions
Document No:
ANSI/IEEE Std 91-1984
Date of Specific Issue Adopted:
9 June 1984
Releasing Industry Group:
The Institute of Electrical and Electronics Engineers, Inc.
Custodians: Military Coordinating Activity:
Army—AR Army—AR
Navy—SH
Air Force—13 (Project DRPR—0231)
Review Activities:
Army—AV, MI, AM CR, ER
Navy—OS, AS
Air Force—15, 17, 11
User Activities:
Army—AT
Navy—MC
NOTICE: When reaffirmation, amendment, revision, or cancellation of this standard is initially proposed, the industry
group responsible for this standard shall inform the military coordinating activity of the proposed change and request
participation.
NOTICE OF ADOPTION
ADOPTION NOTICE 1
1 JULY 1991
IEEE Std 91a-1991
27 JUNE 1991
The Institute of Electrical and Electronics Engineers, Inc., IEEE Std 91a-1991, was adopted on 1 July, 1991 and is
approved for use by the Department of Defense (DoD). Copies of this document are stocked at the Standardization
Documents Order Desk, Bldg 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094 for issue to DoD activities
only. Other Government activities, contractors, private concerns, or other requestors must obtain the document from:
The Institute of Electrical and Electronics Engineers, Inc.
345 East 47th Street
New York, NY 10017
Title of Document:
Supplement to IEEE Standard Graphic Symbols for Logic Functions
Date of Specific Issue Adopted: 27 June 1991
Releasing Industry Group: The Institute of Electrical and Electronics Engineers, Inc.
Custodians: Military Coordinating Activity:
Army—AR Army—AR
Navy—OS
Air Force—13 (Project DRPR—0314)
Review Activities:
Army—AT, AV, CR, ER, MI
Navy—AS, EC, MC, SH
Air Force—11, 13, 15, 16, 17, 99
DLA—DH, ES
NSA—NS
User Activities:
Army—AT
AMSC N/A AREA DRPR
DISTRIBUTION STATEMENT A
. Approved for public release; distribution is unlimited.
IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of
the IEEE Standards Board. Members of the committees serve voluntarily and without compensation. They are not
necessarily members of the Institute. The standards developed within IEEE represent a consensus of the broad
expertise on the subject within the Institute as well as those activities outside of IEEE that have expressed an interest
in participating in the development of the standard.
Use of an IEEE Standard is wholly voluntary. The existence of an IEEE Standard does not imply that there are no other
ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE
Standard. Furthermore, the viewpoint expressed at the time a standard is approved and issued is subject to change
brought about through developments in the state of the art and comments received from users of the standard. Every
IEEE Standard is subjected to review at least every five years for revision or reaffirmation. When a document is more
than five years old and has not been reaffirmed, it is reasonable to conclude that its contents, although still of some
value, do not wholly reflect the present state of the art. Users are cautioned to check to determine that they have the
latest edition of any IEEE Standard.
Comments for revision of IEEE Standards are welcome from any interested party, regardless of membership
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Interpretations: Occasionally questions may arise regarding the meaning of portions of standards as they relate to
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important to ensure that any interpretation has also received the concurrence of a balance of interests. For this reason,
IEEE and the members of its societies and Standards Coordinating Committees are not able to provide an instant
response to interpretation requests except 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 Board
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P.O. Box 1331
Piscataway, NJ 08855-1331
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Authorization to photocopy portions of any individual standard for internal or personal use is granted by the Institute
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To arrange for payment of licensing fee, please contact Copyright Clearance Center, Customer Service, 222
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Note: Attention is called to the possibility that implementation of this standard may require use of subject matter
covered by patent rights. By publication of this standard, no position is taken with respect to the existence or
validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying all patents
for which a license may be required by an IEEE standard or for conducting inquiries into the legal validity or
scope of those patents that are brought to its attention.
Introduction
(This introduction is not part of IEEE Std 91-1984, IEEE Standard Graphic Symbols for Logic Functions, or of IEEE Std 91a-1991,
Supplement to IEEE Std 91-1984.)
Two standards are included in this document: IEEE Std 91-1984, IEEE Standard Graphic Symbols for Logic
Functions, and IEEE Std 91a-1991, Supplement to IEEE Std 91-1984. In this edition (published in 1996), the two
standards have been merged to make it more convenient for the user.
The following sections of the original IEEE Std 91-1984 were extensively revised and replaced by IEEE Std 91a-
1991:
Pictorial Table of Contents
Table of Contents
Section 6: Symbols for Highly Complex Functions
Appendix A: Recommended Symbol Proportions
Appendix D: Integrated Circuits Used as Examples, Commercial Part Numbers vs. Symbol Numbers
Index
Numerous other revisions to IEEE Std 91-1984 in Sections 1 through 5 were made. The new Table of Contents and the
new Index indicate specifically where revisions were made. Further, change bars marked in the outside margins
indicate the locations of significant changes. Each standard has a unique foreword, included below.
IEEE Std 91-1984 foreword
This standard defines an international language by which it is possible to determine the functional behavior of a logic
circuit as described on a logic or circuit diagram with minimal reference to supporting documentation. Like natural
languages, the language set forth in this standard has been designed to allow a single concept to be expressed in one
of several different ways, according to the demands of a particular situation. Consequently, this standard does not
attempt, nor intend to establish single correct symbols for particular devices. A symbol appropriate for one application
of a device may not be appropriate for another.
The contributors to this standard represent a broad range of institutions, technologies, and documentation needs. They
include industrial, governmental, and educational organizations, producers and consumers of devices and equipment,
users and non-users of computer-aided design and drafting, and a considerable range of aesthetic preferences. That a
consensus of such diverse interests could be achieved in producing this standard is indicative of not only the utility of
the approach, but more importantly, of the increasing need among designers and maintainers of digital systems for a
common and more nearly complete symbolic language.
This revision is the result of a continuing activity to arrive at a useful notation to permit free interchange of
information on the design of binary-operated controls and systems. It is the latest step in a program that began in 1956
within the IEEE to develop a comprehensive single standard, consistent with ongoing developments in technology and
logic symbology, from several ad hoc, industry, military, and international standards. In 1960, an ad hoc group on
logic diagram graphic symbols was formed within the American National Standards Institute in order to develop a
draft American Standard. In 1961, this committee became a permanent subcommittee, Y32.14, of the Graphic
Symbols Committee, Y32, under the cosecretariat of ASME and IEEE. Its work resulted in the publication of IEEE
Std 91-1962 (ANSI Y32.14-1962 ), adopted in 1965 by the US Navy. The subcommittee was reorganized in 1969 to
prepare a new draft standard that would have broader acceptance and be in accord with the developments within the
International Electrotechnical Commission (IEC). ANSI/IEEE Std 91-1973 (Y32.14-1973) subsequently received
approval from ANSI, and the US Department of Defense, and was substantially compatible with IEC Pub 117-15,
Recommended Graphical Symbols: Binary Logic Elements. Since 1977 the preparing committee, IEEE SCC 11.9, has
worked closely with IEC Technical Committee 3 to prepare major new revisions of this standard and IEC Pub 617,
Part 12 (the successor to Pub 117, Part 15). The aim was for a US standard that would be mutually compatible with the
IEC standard, broadly acceptable, and that would provide notation or guidelines by which any SSI through VLSI
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