The MD27128A-25/B, manufactured by Rochester Electronics, is a 128K (16K x 8) EPROM (Erasable Programmable Read-Only Memory) IC. This device is a non-volatile memory chip, meaning it retains its stored data even when power is removed. Rochester Electronics specializes in providing continued support for mature and end-of-life semiconductors, ensuring that this EPROM remains available for legacy systems and applications.

Applications:

• Embedded systems: Used for storing firmware and program code in embedded systems such as industrial controllers, instrumentation, and consumer electronics.
• Legacy computer systems: Serves as a storage medium for BIOS and operating system code in older computer systems.
• Aerospace and defense applications: Employed in military and aerospace systems where long-term availability and reliability are critical.
• Industrial automation: Used in programmable logic controllers (PLCs) and other automation equipment for storing control programs.
• Data logging: Used in data loggers for storing sensor data and other information.

Features:

• 128K (16K x 8) Memory Capacity: Stores 128 kilobits of data organized as 16,384 bytes.
• Non-Volatile Memory: Retains data even when power is removed.
• Fast Access Time: 250ns access time allows for quick retrieval of stored data.
• UV Erasable: Can be erased using ultraviolet light and reprogrammed.
• TTL Compatible: Interfaces easily with TTL (Transistor-Transistor Logic) circuits.

Benefits:

• Reliable Data Storage: Non-volatile memory ensures data retention in the absence of power.
• Long-Term Availability: Rochester Electronics guarantees the continued availability of this device.
• Easy Reprogramming: UV erasability allows for updating stored data.
• Wide Operating Voltage: Operates over a wide range of voltages.
• Mature Technology: Well-understood and reliable EPROM technology.

The MD27128A-25/B is suitable for applications where non-volatile memory is needed and long-term availability is crucial. As an EPROM, it can be erased and reprogrammed using a UV EPROM eraser, allowing for firmware updates or changes in program code. The relatively slow access time compared to modern memory technologies limits its use to legacy systems and applications where speed is not critical. Datasheets provide detailed information on its electrical characteristics, programming procedures, and erasure methods. Proper handling and ESD precautions are recommended during installation and operation.