The X28HC256J-12 is a 256K CMOS EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by Intersil (now Renesas). It provides non-volatile memory that can be electrically erased and reprogrammed. Its in-system programmability makes it suitable for applications requiring frequent data updates without requiring physical removal of the chip.

Applications:

• Embedded Systems: Used for storing firmware, boot code, and configuration data in a wide range of embedded applications.
• Industrial Control Systems: Stores calibration data, program parameters, and system configurations in PLCs and other industrial equipment.
• Networking Equipment: Stores configuration data and firmware in routers, switches, and other networking devices.
• Automotive Electronics: Used for storing calibration data, engine control parameters, and diagnostic information in automotive systems.
• Instrumentation: Stores calibration curves, measurement parameters, and data logs in scientific and industrial instruments.

Features:

• 256Kbit (32K x 8) Organization: Provides a storage capacity of 256 kilobits, organized as 32768 bytes of 8 bits each.
• Fast Access Time: Offers a typical access time of 120ns, enabling fast read operations.
• Low Power Consumption: CMOS technology ensures low power dissipation, making it suitable for battery-powered applications.
• Electrically Erasable and Programmable: Can be erased and reprogrammed electrically, allowing for in-system updates.
• Page Mode Write: Supports page mode write operations, allowing for faster programming of multiple bytes.
• Data Retention: Retains data for extended periods even when power is removed.
• JEDEC Standard Pinout: Adheres to the JEDEC standard pinout for easy integration into existing systems.
• Endurance: Offers a specified number of erase/write cycles, ensuring reliability over the product's lifespan.

Benefits:

• Flexibility: Electrically erasable and programmable, allowing for easy updates and modifications.
• Non-Volatile Storage: Retains data even when power is off, ensuring data integrity.
• Reliability: High endurance and data retention characteristics ensure reliable operation.
• Ease of Integration: Standard pinout simplifies integration into existing systems.
• Low Power Consumption: Suitable for battery-powered and energy-efficient applications.

Additional Details:

The X28HC256J-12 operates on a single 5V power supply. It features a TTL-compatible I/O interface for easy interfacing with microprocessors and microcontrollers. The device's write protection feature prevents accidental data corruption during programming. It's typically available in a 28-pin PDIP (Plastic Dual In-line Package). Its operating temperature ranges from 0°C to +70°C.