The AT93C56 is a 2Kbit Serial EEPROM manufactured by Atmel (now Microchip Technology). It is organized as either 256 x 8 or 128 x 16 bits, selectable through the ORG pin. This EEPROM is designed for a variety of applications requiring non-volatile data storage. While designated as END-OF-LIFE, it was commonly used for storing small amounts of configuration data or settings in embedded systems.

Applications

• Storing configuration parameters in electronic devices.
• Storing serial numbers or identification codes.
• Storing calibration data for sensors.
• Storing user preferences in consumer electronics.
• Security applications requiring non-volatile memory.

Features

• 2Kbit (256 x 8 or 128 x 16) EEPROM.
• 3-wire serial interface (compatible with SPI).
• Low-voltage operation.
• Self-timed write cycle.
• High reliability (1,000,000 erase/write cycles).
• Data retention: 100 years.
• Write protect feature.

Benefits

• Non-volatile memory ensures data is retained even without power.
• Simple 3-wire interface simplifies connection to microcontrollers.
• Low-voltage operation makes it suitable for battery-powered applications.
• Self-timed write cycle reduces software overhead.
• High reliability ensures long-term data storage.
• Write protect prevents accidental data corruption.

Additional Details

The AT93C56 uses a 3-wire interface consisting of chip select (CS), serial data in (DI), and serial data out (DO), along with a clock signal (SK). It supports a self-timed write cycle, meaning the microcontroller does not need to manage the timing of the write operation. The organization of the memory (256x8 or 128x16) is selected via the ORG pin. As an end-of-life component, newer designs should consider alternative EEPROM solutions. However, it remains relevant for maintaining older systems. Detailed specifications, including timing diagrams and electrical characteristics, are available in the device datasheet from Microchip Technology.