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SRAM is preferred to DRAM for the small on-chip memory of a microcontroller because it

  • A.stores considerably more bits per unit of die area than DRAM manages to do
  • B.retains its contents when the supply is removed
  • C.can be erased in blocks under program control
  • D.needs no refresh and can be built in the same process as the logic

Answer: D

A refresh controller and the special capacitor process DRAM needs are both unwelcome on a logic die. SRAM costs six transistors a bit against DRAM's one and a capacitor, so it is far less dense, which is why it is used in kilobytes and DRAM in megabytes.

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