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In a strict sense, the term density refers to the number of memory cells per squarearea of silicon. In practice, however, density often refers to the number of bits that canbe represented on a standard size chip. Thus, an engineer might refer to a ‘‘1 megchip’’, meaning a standard size chip that holds one megabit of memory. Higher densityis usually desirable because it means more memory can be held in the same physicalspace. However, higher density has the disadvantages of increased power utilizationand, because more electric current generates more heat, increased heat generation.The density of memory chips is related to the size of transistors in the underlyingsilicon technology, which has followed Moore’s Law. Thus, memory density tends todouble approximately every eighteen months.
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