M93C86, M93C76, M93C66, M93C56, M93C46 16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit (8-bit or 16-bit wide) MICROWIRE® Serial Access EEPROM
This handbook provides an overview of the STMicroelectronics M93C86, M93C76, M93C66, M93C56 and M93C46 electrically erasable programmable read‑only memory (EEPROM) devices. It describes the MICROWIRE serial interface, memory organization options (byte or word), power‑on data protection, and the full instruction set used for reading, writing and erasing data.
The document includes package mechanical data for PDIP, SO, TSSOP and MLP variants, electrical characteristics such as supply voltage ranges, clock rates and write times, as well as reliability figures like erase/write cycle endurance and data retention. Tables list memory capacities, operating conditions, absolute maximum ratings and ordering information for each device family.
| Supply voltage (standard) | 4.5 V to 5.5 V |
|---|---|
| Supply voltage (W version) | 2.5 V to 5.5 V |
| Supply voltage (R version) | 1.8 V to 5.5 V |
| Clock rate / write time (standard) | 1 MHz, 10 ms write time |
| Clock rate / write time (new product) | 2 MHz, 5 ms write time |
| Memory capacity (M93C86) | 16 Kbit (16384 bits, 2048 bytes) |
| Erase/Write endurance | More than 1 Million cycles |
| Data retention | More than 40 years |
The standard M93C86 operates from 4.5 V to 5.5 V.
The devices are rated for more than 1 Million erase/write cycles.
The original devices support a 1 MHz clock rate with a 10 ms write time.
The M93C86 provides 16 Kbit of memory (16384 bits, organized as 2048 bytes).