The AT93C56A/66A is a high-reliability automotive application electrically erasable programmable read-only memory (EEPROM) with 2048/4096 bits of storage capacity, can work in the voltage range of 2.7V to 5.5V, and the operating temperature range is -40°C to 125°C. The device uses a three-wire serial interface, has a clock rate of 2MHz and a self-timed write cycle (10ms maximum), and can be enabled through the Chip Select (CS) pin.
The AT93C56A/AT93C66A are serial electrically‑erasable programmable read‑only memory (EEPROM) devices offering 2 Kb or 4 Kb of storage. They operate from 2.7 V to 5.5 V and support a three‑wire serial interface for read, write, and erase operations.
The datasheet provides absolute‑maximum ratings, electrical characteristics, pin configurations, timing diagrams, and mechanical dimensions for both 8‑lead SOIC and 8‑lead TSSOP packages. It also lists the instruction set used to control the device.
| Supply voltage | 2.7 V to 5.5 V |
|---|---|
| Organization | 2K: 256 × 8 or 128 × 16; 4K: 512 × 8 or 256 × 16 |
| Maximum clock rate | 2 MHz |
| Endurance | 1 Million write cycles |
| Data retention | 100 years |
| Operating temperature range | -40 °C to 125 °C |
| Pin capacitance (DO, CS, SK, DI) | 5 pF |
| Read current (1 MHz) | 2.0 mA |
The device operates from 2.7 V to 5.5 V.
It can endure up to 1 million write cycles.
The maximum clock rate is 2 MHz.
AT93C56A offers 2 Kb organized as 256 × 8 or 128 × 16; AT93C66A offers 4 Kb organized as 512 × 8 or 256 × 16.