The TMM27256AD-15 is a high-speed, 256K-bit (32,768 words x 8 bits) Erasable Programmable Read-Only Memory (EPROM) manufactured by Toshiba Semiconductor and Storage. This EPROM is designed for applications requiring non-volatile memory storage and the capability to be reprogrammed. The -15 indicates an access time of 150ns.

Applications

• Embedded Systems: Storage of firmware and boot code in various embedded applications.
• Industrial Automation: Used in programmable logic controllers (PLCs) and other industrial control equipment for storing control algorithms.
• Telecommunications Equipment: Stores configuration data and software in network devices.
• Medical Devices: Employed in medical instruments for storing calibration data and operational software.
• Automotive Electronics: Used for storing engine control unit (ECU) parameters and software.

Features

• High-Speed Access: 150ns access time allows for quick data retrieval.
• Erasable and Reprogrammable: Can be erased using ultraviolet (UV) light and reprogrammed, allowing for firmware updates.
• Single 5V Power Supply: Operates on a single 5V power supply, simplifying system design.
• Fully Static Operation: Does not require clocking or refresh cycles, simplifying timing control.
• Three-State Output: Allows for easy memory expansion and bus sharing.
• TTL Compatible: Compatible with standard TTL logic levels.

Benefits

• Fast System Performance: The high-speed access time contributes to faster program execution.
• Flexibility in Development: Reprogrammability allows for easy updates and modifications to stored data.
• Simplified System Design: The single 5V power supply simplifies power supply requirements.
• Easy System Integration: TTL compatibility allows for easy interfacing with other components.
• Reliable Data Storage: Provides non-volatile data storage, retaining data even when power is off.

Additional Details

The TMM27256AD-15 comes in a 28-pin DIP (Dual In-line Package). It requires a UV EPROM programmer for programming and erasure. Electrostatic discharge (ESD) precautions are necessary when handling the device. Consult the official Toshiba datasheet for detailed electrical characteristics, timing diagrams, and programming specifications. Its durable design makes it suitable for a wide range of operating environments. Data retention is typically guaranteed for several years under normal operating conditions.