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With data-logging memories, system designers face some common challenges. Industrial and automotive systems require high bandwidths for read/write operations, while reducing the device footprint. Systems that use parallel interface memories (such as a static RAM with battery back-up) consume too many microcontroller pins. In contrast, many serial interface memories simply lack the bandwidth of a parallel interface memory. The second challenge is data reliability. The last instance of data needs to be captured in the event of a power failure. Non-volatile memories like EEPROMs require a back-up power source, usually a bulky super capacitor, to capture buffered data on power loss. EEPROM memories also have low endurance limitations. In other words, the memory cell wears out faster as the number of erase cycles increases. Thirdly, systems require energy-efficient data-logging memories to extend battery life. Non-volatile memories like EEPROMs require higher active currents and take a long time to write the data, which translates to slower speed and higher power consumption. In summary, system designers need energy-efficient, high-performance, and high-reliability data-logging memory solutions.
