This document introduces the 93AA46A/B/C, 93LC46A/B/C, 93C46A/B/C series products from Microchip Technology Inc. These products use low-power CMOS technology and have features such as self-timed erase/write cycles, automatic erase before write, power-on/off data protection circuitry, and industry standard 3-wire serial I/O interface. The products include versions with 128 x 8-bit organization, 64 x 16-bit organization, and word-selectable versions that depend on external logic levels for word size setting. They are ideal for low-power, nonvolatile memory applications.
The Microchip 93AA46/93LC46/93C46 series are 1‑Kbit low‑voltage Microwire serial EEPROMs available in 8‑bit (A) and 16‑bit (B) organizations, with an optional ORG pin for the C versions to select word size. They are offered in a variety of plastic packages (PDIP, SOIC, MSOP, TSSOP, SOT‑23) and support both industrial (‑40 °C to +85 °C) and automotive (‑40 °C to +125 °C) temperature ranges.
Key features include self‑timed erase/write cycles, automatic ERASE‑before‑WRITE, power‑on/off data protection, up to 1 000 000 write/erase cycles, and data retention of over 200 years. The datasheet provides detailed pin assignments, electrical characteristics, timing diagrams, and the full instruction set for programming and reading the devices.
| Memory organization (A version) | 128 × 8‑bit |
|---|---|
| Memory organization (B version) | 64 × 16‑bit |
| Supply voltage (93AA46A/B) | 1.8 V – 5.5 V |
| Supply voltage (93LC46A/B) | 2.5 V – 5.5 V |
| Supply voltage (93C46A/B) | 4.5 V – 5.5 V |
| Operating temperature (Industrial) | -40 °C to +85 °C |
| Operating temperature (Automotive) | -40 °C to +125 °C |
| Endurance (write/erase cycles) | 1 000 000 cycles |
| Data retention | > 200 years |
The automotive‑grade devices operate from –40 °C up to +125 °C.
CS is the Chip Select pin used to start and end communication cycles.
Each device in the 93XX46 family contains 1 Kbit (1024 bits) of EEPROM memory.