The AT93C46/56/57/66 is a serial electrically erasable programmable read only memory (EEPROM) with 1024/2048/4096 bits of storage capacity and an internal organization of 64/128/256 words of 16 bits each when the ORG pin is connected to VCC and 128/256/512 words of 8 bits each when it is tied to ground. The device is optimized for use in many industrial and commercial applications where low power and low voltage operations are essential. AT93C46/56/57/66 is available in space saving 8-pin PDIP and 8-pin JEDEC and EIAJ SOIC packages.
The AT93C46/56/57/66 series are low‑voltage, 3‑wire serial EEPROMs offering 1 K, 2 K or 4 K bits of memory. They are supplied in 8‑pin PDIP, SOIC and TSSOP packages and are suited for industrial and commercial applications where low power consumption is required.
The datasheet describes the device’s voltage options, timing diagrams, instruction set, pin configurations, and mechanical dimensions, as well as absolute maximum ratings and reliability figures such as endurance and data retention.
| Supply Voltage Range | 1.8 V to 5.5 V (multiple versions) |
|---|---|
| Memory Capacity | 1024 bits (AT93C46), 2048 bits (AT93C56), 4096 bits (AT93C57/66) |
| Endurance | 1 Million write cycles |
| Data Retention | 100 years |
| ESD Protection | > 4000 V |
| Write Cycle Time | 10 ms max (self‑timed) |
| Storage Temperature (stress rating) | -65 °C to +150 °C |
| Package Types | 8‑Pin PDIP, 8‑Pin JEDEC/EIAJ SOIC, 8‑Pin TSSOP |
The devices are offered in versions that operate from 1.8 V up to 5.5 V, with specific options such as 4.5 V‑5.5 V, 2.7 V‑5.5 V and 2.5 V‑5.5 V.
The AT93C46 provides 1 Kbit (1024 bits), the AT93C56 provides 2 Kbit (2048 bits), and the AT93C57/66 provide 4 Kbit (4096 bits) of EEPROM.
Each device is rated for up to 1 million write cycles.
They are offered in 8‑pin PDIP, 8‑pin JEDEC/EIAJ SOIC and 8‑pin TSSOP packages.