The UPD27128C is an EPROM (Erasable Programmable Read-Only Memory) manufactured by NEC. EPROMs are a type of non-volatile memory that can be programmed and erased, although the erasing process typically involves exposure to ultraviolet light. They were commonly used in applications where firmware or configuration data needed to be stored and occasionally updated.

Applications

• Firmware storage in embedded systems.
• Storing boot code in early computer systems.
• Storing game code in arcade machines and early video game consoles.
• Storing configuration settings in industrial equipment.
• Storing character sets and fonts in printers and other output devices.

Features

• Non-volatile memory: Data is retained even when power is removed.
• Erasable and programmable: Allows for data to be updated, albeit with a UV eraser.
• Fast access times: Enables quick retrieval of stored data.
• High reliability: Designed for robust data storage.
• Parallel interface: Connects directly to a microprocessor or microcontroller bus.

Benefits

• Data retention: Ensures that stored data is not lost when power is turned off.
• Reprogrammability: Allows for updates to the stored data, although it requires a UV eraser.
• Fast access: Enables quick access to stored data.
• Robustness: Provides reliable data storage in various environments.
• Ease of use: Simple to integrate with existing systems.

Additional Details

The UPD27128C has a storage capacity of 128 Kbits (16KB). It typically operates at a voltage of 5V. The operating temperature range usually spans from 0°C to +70°C. The package type is commonly a DIP (Dual In-Line Package) with a window for UV erasure. The device requires a UV eraser for erasing the stored data before it can be reprogrammed. The programming process involves applying specific voltages and timing signals to the device's pins.