Neeraj Pends and Michael Pecht
CALCE Electronic Products and Systems Center
University of Maryland
College Park, MD 20742
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 85oC (commercial-off-the-shelf) and -55 to 125oC (military) temperature ranges. In this case study, the electrical parameters of the 74HC244 and the 54HC244 have been characterized over the 25oC to 135oC 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 135oC temperature range.
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