The AT28C64B-20PI is a 64K-bit (8K x 8) Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by Atmel. It's designed for applications that require non-volatile data storage with the ability to be electrically erased and reprogrammed in-system. The "-20PI" likely refers to a 200ns access time and a PDIP (Plastic Dual In-line Package).

Applications

• Storage of configuration settings in embedded systems.
• Storage of calibration data.
• Storage of user preferences in electronic devices.
• Data logging applications.
• Replacement for older EPROM designs in existing systems.

Features

• Electrically Erasable and Programmable: Can be erased and programmed in-system without UV light.
• Non-volatile data storage: Retains stored data even when power is off.
• Fast Access Time: 200 ns access time allows for quick data retrieval.
• Page Write Mode: Allows for writing multiple bytes in a single operation, improving write speed.
• Low Power Consumption: Minimizes power requirements, making it suitable for battery-powered applications.

Benefits

• Easy in-system updates and modifications without needing to remove the chip.
• Reliable storage of critical data.
• Quick access to stored information.
• Faster write operations due to page write capability.
• Suitable for low-power applications.

Additional Details

The AT28C64B-20PI operates from a single 5V power supply. It is commonly available in a PDIP package. The EEPROM utilizes electrical signals for both erasing and programming, eliminating the need for UV light. Its 200ns access time allows for reasonably fast data retrieval. As an 'END-OF-LIFE' component, it's no longer actively manufactured by Atmel, meaning availability depends on existing stock levels and surplus suppliers. Ensuring compatibility with the system's memory interface and adhering to programming specifications are vital for correct operation.