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Static random-access memory (static RAM or SRAM) is a type of semiconductor memory that uses bistable latching circuitry (flip-flop) to store each bit. SRAM exhibits data remanence,but it is still volatile in the conventional sense that data is eventually lost when the memory is not powered.  

PSRAM  is dynamic RAM with built-in refresh and address-control circuitry to make it behave similarly to static RAM (SRAM). It combines the high density of DRAM with the ease of use of true SRAM.   

Magnetic Random Access Memory ( MRAM ) Magnetoresistive random-access memory (MRAM) is a non-volatile random-access memory technology available today that began its development in the 1990s. Unlike conventional RAM chip technologies, data in MRAM is not stored as electric charge or current flows, but by magnetic storage elements MRAM has similar performance to SRAM, similar density to DRAM but much lower power consumption than DRAM, It is currently in production by Everspin,

Ferroelectric RAM Ferroelectric RAM (FeRAM, F-RAM or FRAM) is a random-access memory similar in construction to DRAM: uses a ferroelectric layer instead of a dielectric layer to achieve non-volatility.  FeRAM is one of a growing number of alternative non-volatile random-access memory technologies 

NV SRAM NVSRAM can provide 16kb to 16Mb of storage capacity, access time up to 70ns. NVSRAM is a type of non-volatile random-access memory (NVRAM). It is similar in operation to static random-access memory (SRAM). 

Synchronous dynamic random-access memory (SDRAM) is any dynamic random-access memory (DRAM) where the operation of its external pin interface is coordinated by an externally supplied clock signal. 

Flash memory is an electronic (solid-state) non-volatile computer storage medium that can be electrically erased and reprogrammed.Toshiba developed flash memory from EEPROM (electrically erasable programmable read-only memory) in the early 1980s and introduced it to the market in 1984. The two main types of flash memory are named after the NAND and NOR logic gates. The individual flash memory cells exhibit internal characteristics similar to those of the corresponding gates.

Bare Die/ Wafer A die (pronunciation: /d??/) in the context of integrated circuits is a small block of semiconducting material, on which a given functional circuit is fabricated.. A wafer, also called a slice or substrate, is a thin slice of semiconductor material, used in electronics for the fabrication of integrated circuits and in photovoltaics for conventional, wafer-based solar cells.   

A microcontroller (or MCU, short for microcontroller unit) is a small computer (SoC) on a single integrated circuit containing a processor core, memory, and programmable input/output peripherals. Program memory in the form of Ferroelectric RAM, NOR flash or OTP ROM is also often included on chip, as well as a typically small amount of RAM. Microcontrollers are designed for embedded applications, in contrast to the microprocessors used in personal computers or other general purpose applications consisting of various discrete chips.