DRAM

In typical DRAM standards, which is closest to the period within which every cell must be refreshed once? (Normal temperature range)

  1. AAbout 64 ms
  2. BAbout 64 µs
  3. CAbout 64 s
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Answer: A. About 64 ms

Typical DDR-family DRAMs require all rows to be refreshed within about 64 ms in the normal temperature range. In practice, refresh commands are issued several thousand times within this period, refreshing a few rows at a time.

  • A. Correct. All cells are normally refreshed within 64 ms.
  • B. 64 µs is too short; refresh would take up too much time.
  • C. 64 s is too long for cells to retain their data.
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