AT45DB021-RC

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A non-volatile memory commonly used at present is the Atmel AT45DB021-RC Memory. Its application field covers from industrial control, security field, communication and entertainment, etc, to common electronic products, such as game machine, digital camera, digital communicator etc. Its outstanding features such as high speed and reliability make it become one the most important parts of the digital device.The Atmel AT45DB021-RC Memory is a kind of Flash memories, which can be divided into three types, NOR Flash, NAND Flash and EEPROM. The AT45DB021-RC Memory belongs to NAND Flash.NAND Flash can store data like NOR Flash, but it applies different circuit topology. The main idea of NAND Flash is that instead of making each bit of the Flash into an independent and addressable unit, NAND Flash connects a large number of these bits into a single array and then creates a tunnel-like data transfer structure so that the data of the memory can be read in blocks.NAND Flash also has a feature of storing data in blocks instead of bits, which can adjust its storage capacity according to user needs. For instance, if one only needs 1KB of space, one could just cut off the remaining data in the memory block instead of buying 2KB of memory space.The Atmel AT45DB021-RC Memory is composed of a small NAND Flash core with 2-bit architecture and 256 Kbits of SLC program and erase memory. The chip is made under 0.18μm fabrication process with a single-poly six-transistor (6T) cell design. The chip is connected to the host processor via External Bus Interface (EBI). Through a simple 4-wire serial interface, the chip can transfer up to 8 bits of data in one cycle.At the same time, this chip is designed with the elective Serial Peripheral Interface Bus (SPI) protocol, which enables faster read/write speed without sacrificing the endurance of the memory chip.In user\'s perspective, the Atmel AT45DB021-RC Memory looks like a normal random access memory (RAM). In this way, the user can be able to write data through an external bus, add and erase data with higher efficiency.Moreover, the Atmel AT45DB021-RC Memory achieves a better data read and write speed performance mainly due to its 2-bit architecture. It can achieve the shortest write latency and the data write throughput up to tens of mega bits per second Thus its Write/Erase time which is less than 10 millisecond can also satisfy high speed data transmission requirements.In addition, the Atmel AT45DB021-RC Memory has the obvious superiority of multi-level cell discrimination, particularly suitable for high-density applications. Its error detecting and correcting coding make the data more secure and reliable.In conclusion, with its high speed, reliability and low cost, the Atmel AT45DB021-RC Memory has been widely used in many applications such as game machine, digital camera, digital communicator etc., making life more intelligent and technology more convenient.

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