The MR27128A-20/BZA is a 128K (16K x 8) EPROM (Erasable Programmable Read-Only Memory) manufactured by Rochester Electronics. Rochester Electronics specializes in providing continued support for end-of-life (EOL) and obsolete semiconductors. This particular EPROM is likely used in legacy systems and applications where non-volatile memory storage is required. The "-20" likely indicates an access time of 200ns.

Applications

• Legacy Embedded Systems: Used in older industrial control systems, medical equipment, and telecommunications devices.
• Early Generation Computer Systems: Provides storage for boot code and operating system kernels.
• Arcade Games: Stores game code and data in older arcade machines.
• Instrumentation Equipment: Used in test and measurement instruments for storing calibration data and program code.
• Military and Aerospace Applications: Deployed in older systems where continued availability of specific components is critical.

Features

• 128K (16K x 8) Memory Organization: Stores 128 kilobits of data, organized as 16,384 bytes.
• Erasable and Reprogrammable: Can be erased using ultraviolet light and reprogrammed with new data.
• Non-Volatile Storage: Retains data even when power is removed.
• Fast Access Time: Offers relatively fast data retrieval speeds.
• TTL Compatible Inputs/Outputs: Interfaces directly with TTL logic circuits.

Benefits

• Continued System Support: Ensures continued operation of legacy systems by providing access to obsolete components.
• Data Retention: Preserves critical data even in the absence of power.
• Reprogrammability: Allows for updates and modifications to stored data.
• Simplified System Design: TTL compatibility simplifies integration into existing circuits.
• Cost-Effective Solution: Provides a cost-effective solution for maintaining older systems.

Technical Specifications

The MR27128A-20/BZA is a 128K EPROM with an access time of 200ns. It operates with a single +5V power supply and features TTL-compatible inputs and outputs. The device is typically packaged in a DIP (Dual In-Line Package) for easy insertion into circuit boards. More detailed specifications, including power consumption, programming voltage, and timing diagrams, can be found in the Rochester Electronics datasheet for this part. Information on UV erasure procedures is also generally available. Given it's an older EPROM, it requires a UV EPROM eraser for clearing its contents.