The Mitsubishi M5L2708K is a 8192-bit (1024 x 8) Erasable Programmable Read-Only Memory (EPROM). This EPROM was commonly used in embedded systems and early computer systems for storing firmware and program code that needed to be non-volatile but also occasionally updated or changed.

Applications

• Embedded Systems: Storing firmware in microcontroller-based systems for industrial control, consumer electronics, and automotive applications.
• Early Personal Computers: Storing the BIOS (Basic Input/Output System) in early IBM PC and compatible computers.
• Programmable Logic Controllers (PLCs): Holding the control program in PLCs used in industrial automation.
• Instrumentation: Storing calibration data and program code in test and measurement equipment.
• Arcade Games: Used to store game code and graphics data in arcade game machines.

Features

• 1024 x 8-bit Organization: Provides a storage capacity of 8192 bits, arranged as 1024 bytes.
• Erasable and Reprogrammable: Can be erased using ultraviolet (UV) light and reprogrammed with new data.
• Non-Volatile Memory: Retains data even when power is removed.
• Fast Access Time: Offers a relatively fast access time, enabling quick data retrieval.
• TTL Compatibility: Compatible with Transistor-Transistor Logic (TTL) voltage levels.

Benefits

• Flexibility: Allows for easy updating of firmware and program code.
• Reliability: Provides reliable non-volatile storage for critical data.
• Cost-Effective: Offered a cost-effective solution for storing firmware in a variety of applications.
• Ease of Use: Relatively easy to program and erase using standard EPROM programmers and UV erasers.

Additional Details

The M5L2708K typically requires a +5V power supply for operation. It is programmed using an EPROM programmer that applies specific voltages to the address, data, and control pins. The erasure process involves exposing the chip to UV light through a quartz window on the top of the package. The erasure time depends on the intensity of the UV light source and the age of the EPROM. The chip is housed in a standard DIP (Dual In-line Package) with a quartz window. The M5L2708K has been superseded by EEPROMs and flash memory, but played an important role in early embedded systems and computer technology.