The UPD27C256AD-15 is a 256Kbit (32K x 8) CMOS EPROM (Erasable Programmable Read-Only Memory) manufactured by NEC. It's designed for applications requiring non-volatile storage of program code or data in embedded systems and other electronic devices.

Applications

• Embedded Systems: Used for storing firmware in microcontrollers and other embedded devices.
• Industrial Control Systems: Stores configuration data and control programs.
• Consumer Electronics: Commonly found in devices like printers, scanners, and other peripherals to store firmware.
• Telecommunications Equipment: Used to store configuration settings and boot code.
• Instrumentation: Employed for storing calibration data and program code in test and measurement equipment.

Features

• High Speed: Access time of 150ns allows for fast data retrieval.
• 256Kbit Density: Provides a moderate storage capacity for various applications.
• CMOS Technology: Low power consumption, making it suitable for battery-powered devices.
• UV Erasable: Can be erased using ultraviolet light and reprogrammed.
• Single 5V Power Supply: Operates on a single 5V power supply.
• TTL Compatible: Compatible with standard TTL logic levels.

Benefits

• Non-Volatile Memory: Retains data even when power is removed.
• Reprogrammable: Allows for easy updates and modifications to the stored data.
• Low Power Consumption: Extends battery life in portable devices.
• Reliable Data Storage: Provides dependable storage for critical applications.
• Cost-Effective: Offers a balance of performance and affordability.

Additional Details

The UPD27C256AD-15 is typically packaged in a 28-pin DIP or surface-mount package. Programming requires a dedicated EPROM programmer using the manufacturer's specified programming algorithm and voltage levels. Before reprogramming, proper UV erasure techniques must be used to completely erase the memory. Consult the device datasheet for detailed electrical characteristics and programming specifications. The operating temperature range is typically 0°C to 70°C.