 The increase in NAND demand and uses means
there are now many NAND devices with differing
performance capabilities and features. Designers
need to have an understanding of the features and
benefits of each type to select the right device for their
application.
Density and feature set are the starting point in
most designs - however, you soon run into terms SLC
(one bit per cell), MLC (two bits per cell), TLC (three bits
per cell) which refer to the how many bits are stored
in a memory cell. Storing more bits per cell increases
density, thus lowering overall cost, but also impacts
device performance:
- SLC has the highest performance and write
endurance but the largest die size (and
thus highest cost).
- MLC is mainstream NAND, providing balanced performance for a wide range of cost-sensitive, high density applications.
- TLC has the highest cell density, but the lowest performance and endurance specifications. Most often used in mass storage consumer applications (thumb
drives or SD cards) with very high cost sensitivity.
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