Consider the following statements for a DRAM : 1. Bit is stored as a charge. 2. It is made of MOS transistors. 3. Speed of DRAM is faster than processors. 4. Each memory cell requires six transistors. Which of these statements are correct?
Consider the following statements for a DRAM : 1. Bit is stored as a charge. 2. It is made of MOS transistors. 3. Speed of DRAM is faster than processors. 4. Each memory cell requires six transistors. Which of these statements are correct? Correct Answer 1 and 2 only
DRAM:
1). DRAM stores the binary information in the form of electric charges that applied to capacitors.
2). The stored information on the capacitors tends to lose over a period of time and thus the capacitors must be periodically recharged to retain their users.
3). The main memory is generally made up of DRAM chips.
Differences between SRAM and DRAM:
|
SRAM |
DRAM |
|
It has a lower access time, so it is faster compared to DRAM |
It has a higher access time, so it is slower than SRAM |
|
It is costlier than DRAM |
It costs less compared to SRAM |
|
As it requires a constant power supply, consumes more power |
It offers reduced power consumption due to the fact that the information is stored in the capacitor |
|
Due to complex internal circuitry, less storage capacity is available compared to the same physical size of the DRAM memory chip. |
Due to small internal circuitry, large storage capacity is available |
|
It has low storage density |
It has a high storage density |
