DRAM

Compared with SRAM, which is a characteristic of DRAM?

  1. AIt is faster than SRAM and needs no refresh
  2. BIts cells are small and the cost per bit is low, but it needs refresh
  3. CIt retains data when the power is turned off
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Answer: B. Its cells are small and the cost per bit is low, but it needs refresh

DRAM is made of small 1T1C cells, so it is easier to make in large capacities than 6T SRAM and has a lower cost per bit. On the other hand, it needs refresh and is slower than SRAM, so DRAM is used for main memory and SRAM for caches.

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More DRAM questions

  1. Which correctly describes redundancy repair, used to improve DRAM yield?
  2. What does an error-correcting code (ECC) used in memory do?
  3. In DRAM, why is access time shorter when the same row (page) is accessed repeatedly?
  4. Why are high-k materials such as zirconium oxide used for the dielectric film of DRAM capacitors?
  5. Which correctly describes the self-refresh mode of DRAM?