AT28C040-20BI

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An AT28C040-20BI, also referred to as an EEPROM, is a type of memory chip used to store and recall data. Its main application fields include data storage, device configuration settings, and non-volatile code storage. EEPROMs are non-volatile meaning their contents are retained, even when the device is powered off. This makes them especially suited for applications like device settings and software versions.

Application Field

AT28C040-20BI chips are very commonly used for data storage in embedded systems such as product controllers and implantable medical devices. EEPROMs can be used both to save settings and to store program data such as software codes. This type of non-volatile memory can hold a relatively large amount of data and can be easily programmed and read using only a few external components. EEPROMs are very popular in the industry due to their low cost, low power requirements and their ability to be reprogrammed quickly and easily without the need for a high-end programmer.

EEPROMs are also used to store program patches for software systems and often for system-critical data in server systems. The scalability and advancements in EEPROM technology have also made it an attractive option for automotive applications. They are often used within an engine management system to store sensors, diagnostic codes and other operational information.

Working Principle

An EEPROM works by trapping and releasing electrical charges during the writing and erase cycles, respectively. In order to write to the chip’s memory, an address is specified, which acts as a gate during the writing process. In order to erase the data previously stored, the chip must be exposed to ultraviolet light. This process is known as "erasure". Once erasure is complete, new data can be written to the chip. The data is held in memory until a new write or erase cycle is initiated.

The AT28C040-20BI is a 4Mb (512K x 8) EEPROM. It is capable of both writing and erasing data quickly and accurately. All it needs for these operations is a power supply and few external components to perform read and write operations. It is accessed via an 8-bit data bus and addresses are supplied via a 10-bit address bus.

The device has an access time of 40ns, which is fairly good for an EEPROM. It is also very power efficient, operating at a maximum of 50mA read and 30mA write. This low power consumption allows it to be used in low-power applications without increased energy consumption.

AT28C040-20BI is a robust memory chip with a wide range of applications in the embedded systems market. Thanks to its low cost, low power requirements and reprogramming capabilities, the device is becoming increasingly popular among manufacturers and designers. Its ease of use and reliability has made it one of the most widely used memory chips in the industry.

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