I²C EEPROM for calibration and configuration storage
The Microchip 24LCS52T-I/MS is a 2 Kbit serial EEPROM organized as 256 x 8 bits, accessed over an I²C bus running at up to 400 kHz. It stores non-volatile data like calibration constants, serial numbers, and configuration tables in industrial equipment, telecom modules, and embedded controllers.
The 8-MSOP package is small — 3 mm wide — which keeps board area tight, but the tiny pads mean the rework tech needs a steady hand and a fine tip to avoid lifting a pad during a swap.
Write cycle timing and bus occupancy
Each word or page write takes 5 ms, during which the I²C bus is tied up waiting for the internal write cycle to finish. If your firmware is logging data frequently, you need to either buffer writes or accept that the bus is unavailable for other slaves during that window. The 900 ns access time is fast enough for most microcontroller reads — the I²C clock rate, not the access time, is the real bottleneck at 400 kHz.