The Microchip 93AA66B-I/SN: A Robust 16Kb Serial EEPROM for Embedded Systems

In the realm of embedded systems and IoT devices, the reliable and non-volatile storage of critical data is paramount. The Microchip 93AA66B-I/SN stands out as a premier solution, offering designers a dependable and efficient method for storing configuration parameters, calibration data, and operational logs. This 16-kilobit Microwire serial EEPROM memory chip is engineered for performance, durability, and ease of integration into a wide array of applications.

Housed in a compact 8-lead SOIC package, the 93AA66B-I/SN is ideal for space-constrained designs. Its organization is flexible, supporting both 16-bit (512 x 8) or 8-bit (1024 x 16) memory organizations, providing software developers with configuration options to best suit their data structure needs. Communication is handled via the simple and robust 3-wire Microwire serial interface, which requires only a Data In (DI), Data Out (DO), and Clock (SK) line, in addition to a Chip Select (CS). This simplicity reduces the number of GPIO pins required from the host microcontroller, making it an efficient choice for systems with limited I/O.

A key feature of this memory chip is its impressive endurance rating of 1,000,000 erase/write cycles and a data retention period of over 200 years. This ensures that data remains intact through countless power cycles and frequent updates over the entire lifespan of the end product. Furthermore, the device incorporates advanced write-protection mechanisms. A dedicated Write-Enable (ORG) pin allows the memory organization to be permanently set, preventing accidental misconfiguration, while software and hardware write-protect features safeguard stored data from corruption.

The 93AA66B-I/SN operates over a broad voltage range (1.8V to 5.5V) and across the extended industrial temperature range (-40°C to +85°C), guaranteeing reliable performance in environmentally challenging conditions, from automotive systems to industrial controls. Its low-power consumption is equally critical for battery-powered applications, ensuring minimal drain during both active and standby states.

Typical applications are vast and include:

Automotive electronics (storing VIN, mileage, and sensor calibration)

Medical devices (storing patient data and device settings)

Industrial automation (saving machine parameters and usage history)

Consumer electronics (maintaining user preferences and configuration)

Smart meters (logging energy consumption data)

ICGOODFIND: The Microchip 93AA66B-I/SN is a highly reliable and versatile serial EEPROM that delivers essential non-volatile memory capabilities. Its combination of a simple interface, exceptional endurance, long-term data retention, and robust packaging makes it an excellent choice for engineers designing next-generation embedded systems that demand dependable data storage.

Keywords: Serial EEPROM, Microwire Interface, Non-volatile Memory, High Endurance, Industrial Temperature Range