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Soft-error susceptibility of a CMOS RAM: dependence upon power-supply voltage

Technical Report ·
DOI:https://doi.org/10.2172/5079164· OSTI ID:5079164
Two types of delidded CMOS 1024 x 1 RAM (Harris HM 6508-RH and Sandia TA597) have been tested for susceptibility to soft bit errors caused by 150-MeV krypton ions. Bit-error susceptibility was measured as a function of bias voltage and exposure angle with respect to the chip normal. Comparison of measured bit-error rates and thresholds with those computed by use of a simple device model and manufacturer-supplied data shows good agreement in some respects while raising questions in others. In the case of the HM6508-RH RAMs, measured values of critical charge of 1 pC and 2 pC at 5V and 7V, respectively, indicate that the devices can be expected to show bit-error rates in space of approximately 1 x 10-/sup 5/ per chip per day at 7V bias.
Research Organization:
Sandia National Labs., Albuquerque, NM (USA); Aerospace Corp., Los Angeles, CA (USA). Space Sciences Lab.; Auburn Univ., AL (USA). Dept. of Electrical Engineering
DOE Contract Number:
AC04-76DP00789
OSTI ID:
5079164
Report Number(s):
SAND-81-2140; ON: DE82015654
Country of Publication:
United States
Language:
English