MIL-HDBK-1331 Parameters To Be Controlled For The Specification Of Microcircuits, Handbook ForThis handbook describes the parameters required as a minimum for the specification of microcircuits. Parameters, rather than circuits, are considered because circuits vary with the manufacturers involved. Further, circuit designs should be subject to change if improvement results as long as the affected designs are compatible and fully interchangeable. The specific objectives of this document are as follows: a. To provide the minimum parameters that should be specified to ensure adequate evaluation of circuit design and performance. b. To provide maximum commonality of parameters for purpose of test and measurement, within and between major classes of microcircuit types and to allow the recognition of interface problems between types of microcircuits. c. To provide standard abbreviations, definitions and symbols pertinent to the specification of microcircuits. d. To promote maximum interchangeability and compatibility between microcircuits types.

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MIL-HDBK-1331A

APPENDIX A

A.2.1.2  Abbreviations.  An abbreviation is a shortened form of a word or word combination. Abbreviations do not encompass letter symbols or graphic symbols.  Subscripts and superscripts are not used in abbreviations.

A.2.2  Criteria and conventions for letter symbols and abbreviations.

A.2.2.1  Primary symbol.  The symbol used to designate a quantity or parameter.  An abbreviation may be used as the primary symbol.  The primary symbol may be modified by subscripts or superscripts except when the primary symbol is an abbreviation (see A.2.1.2).

A.2.2.2  Secondary symbol.  A subscript or superscript, referred to as the secondary symbol, may be used to modify the primary symbol except when the primary symbol is an abbreviation (see A.2.1.2).

A.2.2.3  Primary and secondary symbol combined.  A letter symbol containing both primary and secondary letters has a unique meaning.  This meaning is not the meaning associated with the primary symbol alone or the secondary symbol, but the combination meaning formed from both.

A.2.2.4  Descriptive information.  Descriptive information concerning a letter symbol may be added in parentheses after and on the same line as the secondary symbol.  The abbreviations "max" and "min" are excluded from this rule.  These designate limit values and are not considered to be part of the symbol itself.

A.2.2.5  Commonly use specific subscript abbreviations.  Terminal and value abbreviations should be as shown below:

Bias                                                B

Common-mode                              C (second subscript) Differential                                     D (second subscript) High logic level                               H

Input                                               I (first subscript) Low logic level                               L

Maximum (peak) value 1/              M  1/ Node                                              N

Output                                            O (first subscript) Offset                                             O (second subscript) Single-ended                                 S

Short-circuit                                   S

1/  This refers to the peak value on a waveform, not to the maximum-limit value.  See A.2.3.2.

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