SRAM and flash memory

Which is closest to the number of layers in recent 3D NAND?

  1. AA few layers
  2. BTens of layers
  3. C200 or more layers
Show answer and explanation

Answer: C. 200 or more layers

3D NAND started at about 24 layers and has increased the layer count with each generation. Products with more than 200 layers are now in mass production, and further layering is under way. The more layers, the harder it becomes to etch deep holes uniformly.

Practice this topic Back to topic

More SRAM and flash memory questions

  1. In NAND flash, what is the role of the select transistors placed at both ends of the series-connected memory cells?
  2. When writing to an SRAM cell, one bit line is pulled down to 0 V to flip the cell's state. What condition is required of the access transistor?
  3. In NAND flash, which programming method applies repeated program pulses with gradually increasing voltage, checking the threshold voltage after each one?
  4. Which command notifies an SSD of space freed by files deleted by the OS, making garbage collection more efficient?
  5. Which non-volatile memory has been integrated on the same chip as logic circuits to store microcontroller programs?