Application of Models
To apply failure rate models, certain characteristics of the device under consideration must be determined. Examples of such characteristics include:
• The number of gates, circuit transistors or bits, as applicable.
• The type of logic (e.g., TTL, I2L or DTL).
• The junction temperature,
Tj. Note that a method for estimating this parameter, when physical measurement is impracticable, is given in
Table A-43.
Device characteristics can be obtained from manufacturers' data books and various other publications.