The X28C256DMB15 is a 256K (32K x 8) CMOS Electrically Erasable PROM (EEPROM) manufactured by Xicor, Inc. EEPROMs are non-volatile memory devices that can be electrically erased and reprogrammed in-circuit. They are commonly used for storing configuration data, calibration parameters, and other non-volatile information in electronic systems. Xicor was acquired by Intersil, which is now part of Renesas Electronics. The part is now likely manufactured by Renesas.

Applications

• Data Storage: Used for storing configuration parameters, calibration data, and serial numbers in embedded systems.
• Program Storage: Employed for storing firmware and boot code in microcontrollers and microprocessors.
• Data Logging: Integrated into data loggers for recording sensor data and other information.
• Industrial Control Systems: Used in industrial control equipment for storing program code and configuration settings.
• Automotive Electronics: Utilized in automotive systems for storing calibration data and diagnostic information.

Features

• High Density: 256K (32K x 8) memory capacity.
• Fast Access Time: 150 ns access time (indicated by the "15" in the part number, often 150ns).
• Low Power Consumption: Designed for low power operation, suitable for battery-powered applications.
• In-Circuit Programmability: Can be programmed and erased electrically without removing it from the circuit.
• Automatic Page Write Operation: Simplifies the write process and reduces programming time.

Benefits

• Non-Volatile Storage: Retains data even when power is removed.
• In-System Programmability: Allows for easy updating of data and firmware in the field.
• Fast Access Time: Enables quick retrieval of stored data.
• Low Power Consumption: Extends battery life and reduces energy costs.
• High Reliability: Ensures data integrity and prevents data loss.

Additional Details

The X28C256DMB15 is typically available in a 28-pin DIP (Dual In-line Package) or SOIC (Small Outline Integrated Circuit) package. The memory is organized as 32,768 bytes. The device supports both byte-wide and page-mode write operations. It operates from a single 5V power supply. The address inputs (A0-A14) select one of the 32,768 memory locations. The data inputs/outputs (DQ0-DQ7) are used to write data into and read data from the selected memory location. The device also features a chip enable (CE), output enable (OE), and write enable (WE) control signals.

The device utilizes Xicor's proprietary Direct Store EEPROM (DEEPROM) technology, which provides high endurance and data retention. It also features automatic page write operation, which allows for writing up to 64 bytes of data in a single operation. The X28C256DMB15 is commonly used in applications where non-volatile data storage, in-system programmability, and low power consumption are required.