8 Kbit serial EEPROM for configuration and calibration data
The ROHM BR93G76F-3BGTE2 is a 8 Kbit serial EEPROM organized as 512 words by 16 bits, accessed through a 3 MHz Microwire interface. It stores non-volatile parameters — calibration coefficients, device configuration bytes, serial numbers, or fault logs — in equipment that needs to retain data through power cycles.
The 1.7 V minimum supply is the spec that matters when this EEPROM shares a 1.8 V MCU rail: it guarantees read and write operation down to the low end of the tolerance band, so a 1.8 V ±5 % rail (1.71 V min) stays within range. The 3 MHz clock rate is the maximum the part guarantees — a host MCU's SPI peripheral running in Microwire mode needs to generate a 3 MHz or slower SCK. At 5 V operation the bus has more noise margin; at 1.8 V the signal edges on a long PCB trace need attention to avoid setup-time violations on the return data. Organized as 512 x 16 bits, the part reads and writes a full 16-bit word per bus transaction. The 5 ms write cycle time per word or page applies after each write command — the host must wait or poll the ready/busy status before the next operation. For a 512-word firmware-parameter table, writing the full array sequentially takes about 2.5 seconds at the worst-case write time.