Abstract
It is shown that the punchthrough device can be used as a passive exponential load in fast static bipolar RAM cells. The advantages are that the cell standby/read current ratio can be very large (> four decades), and that the cell area can be very small due to the fact that the punchthrough load is a vertical device. In this cell, a very small standby power dissipation(<0.1 /spl mu/W) is combined with a short access time (<10 ns). A static noise margin calculation for the cell is included. The general standby/read switching behaviour of memory cells with exponential loads is explained. The cell sensitivity to /spl alpha/-particles is discussed.
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