Abstract:

Due to the increasingly limited availability of military temperature grade electronic parts, some companies are considering the use of commercial electronic parts at a wider temperature range than that specified by the manufacturer, a practice called "uprating". Uprating can be done by three methods: parameter conformance assessment, parameter re-characterization and stress balancing. This paper presents a comparison of the high-temperature electrical performance of Texas Instruments 3-state octal buffers, which are available in both -40 to 85^oC (commercial-off-the-shelf) and -55 to 125^oC (military) temperature ranges. In this case study, the electrical parameters of the 74HC244 and the 54HC244 have been characterized over the 25^oC to 135^oC ambient temperature range. It is found that the performance of both parts is identical, and all the electrical parameters are within the commercial specifications over the 25 to 135^oC temperature range.

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