Which type of memory needs to be regularly refreshed?

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RRB ALP Mechanic Radio & TV 23 Jan 2019 Official Paper (Shift 3)
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  1. DRAM
  2. ROM
  3. SRAM
  4. CMOS

Answer (Detailed Solution Below)

Option 1 : DRAM
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The correct option is 1

Concept:

DRAM:

  •  In a DRAM, a capacitor to store a bit of data is used along with a MOSFET (transfer device) which acts as a switch.
  • It requires only one transistor to store one-bit data whereas SRAM requires 6 transistors.
  • The information is stored in a capacitor.
  • Both read and write operations cannot be performed simultaneously.
  • To store one bit of data, DRAM needs one transistor and one capacitor.
  • Since the capacitor stores the data in the form of charge.
  • To keep the charge stored for a long duration, the capacitor needs to constantly be refreshed. So DRAM is slower and used for main memory.

 

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