The UPD27C1001A-12 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, typically using ultraviolet (UV) light. They are used in applications where firmware or configuration data needs to be stored and occasionally updated.

Applications

• Storing firmware in embedded systems.
• Storing boot code in computer systems.
• Storing program code in early video game consoles and arcade machines.
• Storing configuration settings in industrial control equipment.
• Storing lookup tables and character fonts in various devices.

Features

• Non-volatile memory: Data is retained even when power is removed.
• Erasable and programmable: Allows for data to be updated, although erasure requires UV light.
• Fast access time: 120ns (as indicated by the '-12' in the part number).
• High reliability: Designed for robust data storage.
• Parallel interface: Connects directly to a microprocessor or microcontroller bus.

Benefits

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

Additional Details

The UPD27C1001A-12 has a storage capacity of 1 Mbit (128KB). It typically operates at a voltage of 5V. The operating temperature range is usually from 0°C to +70°C. The package type is commonly a DIP (Dual In-Line Package) with a quartz window for UV erasure. The access time is 120ns, indicating the speed at which data can be read from the memory. A UV eraser is required to erase the stored data before it can be reprogrammed.