The X28C256JI-25 is a 256K (32K x 8) EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by Xicor Inc. It is designed for non-volatile data storage in a wide variety of embedded systems.

Applications

• Embedded systems
• Industrial controls
• Data logging
• Programmable logic controllers (PLCs)
• BIOS storage

Features

• 256K (32K x 8) Capacity: Provides a substantial amount of non-volatile memory.
• Fast Access Time: 250ns access time allows for rapid data retrieval.
• Page Write Mode: Speeds up write operations by writing multiple bytes simultaneously.
• Data Polling: Indicates completion of write operations.
• Automatic Page Write: Simplifies the writing process.

Benefits

• Non-Volatile Storage: Retains data even when power is removed.
• Fast Data Access: Enables quick read and write operations.
• Efficient Write Operations: Page write mode accelerates write speeds.
• Reliable Data Storage: Ensures data integrity over time.
• Versatile Application: Suitable for a wide range of embedded systems.

Additional Details

The X28C256JI-25 operates from a single 5V power supply. It features a typical access time of 250 ns, which is crucial for applications requiring fast data retrieval. The device supports a page write mode, allowing multiple bytes (typically 64 bytes) to be written simultaneously, significantly reducing write times. Data polling is implemented to allow the host system to determine when a write operation is complete, improving system efficiency. The device is available in a JEDEC standard 28-pin DIP or surface mount package. It typically endures 10,000 write cycles per byte. The operating temperature range is generally from 0°C to +70°C.

When using the X28C256JI-25, it's important to adhere to the timing specifications outlined in the datasheet. Proper address decoding and control signal management are essential for reliable operation. Decoupling capacitors should be placed near the power supply pins to minimize noise. Consider the write cycle time and use data polling or other status indicators to ensure that write operations are fully completed before attempting to read the data.