The Microchip 93LC56B-E/SN is a 2Kbit serial EEPROM organized as 128 x 16 bits, accessed through a Microwire (3-wire) synchronous interface. The 2 MHz clock rate supports firmware read/write loops without dead cycles — useful for storing calibration constants, configuration tables, or small lookup data in industrial or automotive modules.
The 8-SOIC footprint is standard across the 93LCxx family, so a density upgrade to 4Kbit or 8Kbit (same package, same pinout) is a straightforward BOM swap if firmware storage grows.
Write-cycle timing and endurance for field updates
Word and page write cycles complete in 6 ms (typical). That is fast enough for in-application parameter updates — think trimming a sensor offset or updating a serial number — without holding the bus for long. The 128 x 16 organization means each write addresses a 16-bit word, which aligns well with 16-bit MCU data paths or packed 8-bit values. For designs that store a few dozen calibration words, this part avoids the overhead of a larger serial Flash.