The X28HC256JI-90 is a 256 Kbit (32Kb x 8) High Endurance EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by Xicor Inc. This memory device is designed for applications requiring non-volatile data storage with frequent write/erase cycles. EEPROMs are commonly used in applications such as data logging, configuration storage, and firmware updates where the ability to electrically erase and reprogram the memory is essential.

Applications

• Data Logging: Storing sensor data and other information in industrial and scientific applications.
• Configuration Storage: Storing system parameters and settings in electronic devices.
• Firmware Updates: Storing boot code and application software in embedded systems.
• Calibration Data Storage: Storing calibration coefficients in instrumentation and control equipment.
• User Preferences: Storing user settings and preferences in consumer electronics.

Features

• 256 Kbit EEPROM: Provides 256 Kbits of non-volatile memory storage.
• High Endurance: Supports a high number of write/erase cycles.
• Fast Access Time: 90ns access time for fast data retrieval.
• Self-Timed Write Cycle: Simplifies write operations by automatically controlling the write cycle timing.
• Page Write Mode: Allows for writing multiple bytes in a single operation for faster write times.

Benefits

• Non-Volatile Storage: Retains data even when power is removed.
• Electrically Erasable and Programmable: Allows for easy updating and modification of stored data.
• High Reliability: Designed for reliable operation in harsh environments.
• Simplified Write Operations: Self-timed write cycle simplifies memory control.
• Fast Data Access: Fast access time enables high-performance operation.

Additional Details

The X28HC256JI-90 operates with a specified supply voltage. Key specifications include endurance (number of write/erase cycles), access time, and operating temperature range. The datasheet provides detailed information on pin assignments, timing diagrams, and electrical characteristics. Proper decoupling capacitors should be used to minimize noise and ensure stable operation. The memory is accessed by providing an address and enabling the chip enable (CE), output enable (OE), and write enable (WE) signals. The page write mode allows for writing multiple bytes simultaneously, improving write performance.