The TMM27256AD-20 is a 256K-bit (32,768 words x 8 bits) Erasable Programmable Read-Only Memory (EPROM) manufactured by Toshiba Semiconductor and Storage. It is designed for applications requiring non-volatile data storage and the ability to be reprogrammed. The -20 indicates an access time of 200ns.

Applications

• Embedded Systems: Used for storing firmware and boot code in embedded systems such as microcontrollers.
• Industrial Control Equipment: Employed in programmable logic controllers (PLCs) and other industrial automation systems for storing control algorithms.
• Computer Peripherals: Stores configuration data and firmware in devices such as printers and scanners.
• Telecommunications: Used in network devices for storing configuration parameters and software.
• Robotics: Provides non-volatile memory for robot control programs and calibration data.

Features

• Erasable and Reprogrammable: Can be erased using ultraviolet (UV) light and reprogrammed electrically.
• Single 5V Power Supply: Operates on a single 5V power supply.
• Fully Static Operation: Does not require clocking or refresh cycles.
• Three-State Output: Allows for easy memory expansion.
• TTL Compatible: Interfaces with standard TTL logic.
• Access Time: 200ns access time ensures rapid data retrieval.

Benefits

• Flexibility in Design: The ability to erase and reprogram facilitates design changes and upgrades.
• Simplified Power Supply: The single 5V power supply simplifies power supply requirements.
• Easy Integration: TTL compatibility allows for easy interfacing with other components.
• Reliable Data Storage: Provides non-volatile storage, retaining data even when power is off.
• Fast Program Execution: 200ns access time contributes to quick program execution.

Additional Details

The TMM27256AD-20 typically comes in a 28-pin DIP (Dual In-line Package). It requires a UV EPROM programmer for programming and erasure. Electrostatic discharge (ESD) precautions should be taken when handling the device. Consult the official Toshiba datasheet for detailed electrical characteristics, timing diagrams, and programming specifications. Data retention is typically guaranteed for many years under normal operating conditions. The device is designed to operate over a wide temperature range, making it suitable for a variety of applications.