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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23

MIL-HDBK-1331A

APPENDIX A

TERMS, LETTER SYMBOLS, ABBREVIATIONS, AND DEFINITIONS

A.1 SCOPE

A.1.1 Scope. This appendix contains terms, letter symbols, abbreviations, and definitions for use with microcircuits. This appendix is not a mandatory part of this handbook. The information contained herein is intended for guidance only.

A.2 GENERAL GUIDELINES FOR LETTER SYMBOLS AND ABBREVIATIONS A.2.1 Letter symbols and abbreviations defined.

A2.1.1 Letter symbols. A letter symbol is a character which is used to designate an electrical or physical quantity or parameter, or units of measurement. This use occurs most frequently in mathematical equations, specifications, and commercial data. The following chart will illustrate the primary distinction between quantity symbols and unit of measurement symbols.

Quantity

Quantity symbol

Unit of measurement

Unit symbol

Current Voltage Power Resistance Impedance Capacitance Inductance Time Temperature Gain (power)

Amplification

(voltage or current)

I, i V, v P, p R, r Z, z C, c

L (upper-case only)

t (lower-case only) T (upper-case only) G (upper-case only) A (upper-case only)

ampere volt

watt ohm ohm farad henry second degree

decibel 4/ (numeric) 5/

A 1/ V w

n 2/ n 2/ F

°C or °F 3/

dB 4/

1/ The unit symbol "A" is used with the metric system of multiplier prefixes; for example, "A" for microamperes.

2/ Ohm should not be abbreviated in text. The unit symbol "n" may be used elsewhere with the metric system of multiplier prefixes.

3/ The unit symbol for degrees "kelvin" is "K" (without the °).

4/ Alternatively, power gain may be expressed as a dimensionless ratio.

5/ Alternatively, voltage and current amplification may be expressed in decibels (unit symbol "dB")

provided the impedance associated with the numerator and denominator of the ration are equal.