The MSM27C256H55AS is a high-speed CMOS EPROM (Erasable Programmable Read-Only Memory) manufactured by OKI/Metcal. It's designed for applications requiring non-volatile storage of data or code.

Applications:

• Embedded Systems: Used for storing firmware and boot code in embedded systems such as industrial controllers and consumer electronics.
• Microcontroller Programs: Stores the executable code for microcontrollers in a variety of applications.
• Data Storage: Employed in devices requiring permanent storage of configuration data or calibration settings.
• Instrumentation: Used to store calibration data and program parameters in test and measurement equipment.
• Aerospace and Defense: Utilized in applications where reliable non-volatile memory is crucial.

Features:

• 256Kbit Capacity: Offers a storage capacity of 256 kilobits.
• High-Speed Access Time: Provides fast read access times, typically around 55ns, allowing for quick retrieval of data.
• CMOS Technology: Low power consumption due to the use of CMOS technology.
• UV Erasable: Can be erased using ultraviolet light, allowing for reprogramming.
• Single Power Supply: Operates with a single +5V power supply.
• JEDEC Standard Pinout: Follows industry-standard pinout for easy integration.

Benefits:

• Non-Volatile Storage: Retains data even when power is removed, ensuring reliable data retention.
• Fast Read Access: Enables quick execution of code and retrieval of data, improving system performance.
• Low Power Consumption: Reduces power consumption, making it suitable for battery-powered applications.
• Reprogrammability: Can be erased and reprogrammed multiple times, providing flexibility in development and testing.
• Easy Integration: Standard pinout simplifies integration into existing systems.

Additional Details:

The MSM27C256H55AS typically comes in a DIP (Dual In-line Package) or surface mount package. The device requires a UV eraser for erasing its contents before reprogramming. Detailed timing diagrams, electrical characteristics, and programming specifications can be found in the device's datasheet provided by OKI/Metcal.