Article

Single Event Effects in High Density CMOS SRAMs

NTT Electrical Communications Laboratories 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-01 Japan
IEEE Transactions on Nuclear Science (Impact Factor: 1.46). 01/1987; DOI: 10.1109/TNS.1986.4334654
Source: IEEE Xplore

ABSTRACT The effects of epi-substrate and a cell power supply layout on heavy-ion induced latch-up for 64K SRAMs are examined by heavy-ion exposure tests using a cyclotron. It is shown that epi-substrate alone is not sufficient to prevent latch-up. A cell power supply layout technique, that is, power is supplied through the well for MOSFETs in the well, combined with epi-substrate is very effective in preventing latch-up for high density CMOS/BULK memories. Soft error cross sections and threshold LETs for various CMOS SRAMs are determined by heavy-ion exposure tests. The threshold LET for conventional 64K SRAMs decreases to about one-fifth that of 1K SRAMs.

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