GreenTree Electronics offers a broad range of Memories, including Volatile and non-Volatile IC’s and Memory modules of world leading manufacturers: Micron, Samsung, Nanya, PSC, Kingston, Infineon, ISSI, IDT, Cypress, Hitachi, NEC, and Toshiba.

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Memory IC’s

Integrated Circuits Memories including Volatile (RAM, DDR) and Non-Volatile (Flash, ROM).

Volatile (RAM)

RAM (Random-access memory) is any semiconductor memory that can be written to, as well as read from. RAM is volatile, meaning the data is stored as long as the memory IC is connected to power; the data is lost at power down. Volatile memories are faster and cheaper than non-volatile.

SRAM
SRAM (Static random-access memory) is used for small cache memory and does not require refresh. Each bit designed in a flip-flop cell, operating faster, yet more expensive than DRAM.

SDRAM
DRAM (Dynamic random-access memory) is the most common and cheap memory configuration, used as the main memory in servers, computers and consumer electronics. The memory cells must be periodically refreshed in order to maintain the stored data, meaning the data is lost when the memory is turned off. SDRAM (Synchronous DRAM) divides the memory into simultaneously accessible blocks, and connected to the bus clock for a Synchronous operation.

DDR SDRAM (Double data rate) transfers 2 consecutive words on each clock cycle.
DDR2 SDRAM transfers 4 consecutive words per internal clock cycle
DDR3 SDRAM transfers 8 consecutive words per internal clock cycle.
DDR4 SDRAM transfers 16 consecutive words per internal clock cycle.
SGRAM (Synchronous graphics RAM) designed for Graphic (Video) Cards.
PSRAM (Pseudostatic RAM) contains a self-memory-refresh hence does not require external refresh and acting like SRAM.

Non-Volatile

Once written, the data is stored and saved in the non-volatile memory and held during power-down. However, the data can only be read (accessed) when the memory IC is connected to power. Non-Volatile are slower and more expensive than Volatile memories, and they are used for storage application even when the device is turned off.

Flash (NVRAM)
working in intermediate in speed between EEPROMS and RAM memory and used for on-board data storage (consumer electronics); Flash Drives (replacing HDD with much more reliable and faster, yet more expensive storage drives).

ROM
ROM (Read-only memory) is used for storing the S/W system and can be immediately accessed on system boot or embedded processor configuration. Typically, it is written once and then only being read during the normal operation.
EPROM (Erasable programmable read-only memory) can be re-written by exposing to an ultraviolet light to erase the existing data, and then plugging it into a PROM programmer
EEPROM (Electrically erasable programmable read-only memory) can be rewritten electrically, while the chip is on the circuit board. The writing process is slow, but enables a periodic update of the system S/W., and re-program on board.

Memory Modules

Memory modules (DIMM, Flash) contains memory IC’s on a module (PCB board) and used for Servers, PC, Laptops and consumer electronics.

DIMM

is the most common memory module and it is available in various memory configurations, from 100 pin SDRAM modules, and up to 288pin DDR 4 modules.

SO-DIMM

half size, smaller outline memory modules used mainly for Laptops.

Flash Memory 

modules and cards are available is various configuration, sockets and I/F. the most common is USB Flash, other configurations are CompactFlash, SD cards, xD, memory stick, and many others. Used mainly for a personal storage and for consumer electronics.

Flash Drive

is a flash based storage disk, with much more reliable and faster access than HDD. Although more expensive, it is slowly replacing the cheap and slow HDD in Servers, PC and Laptops.