The D27C256D-15 is a 256Kbit (32K x 8) CMOS EPROM (Erasable Programmable Read-Only Memory) manufactured by NEC. This memory chip is designed for applications requiring non-volatile storage of data or program code. The CMOS technology ensures low power consumption, making it suitable for battery-backed or power-sensitive applications. The device is programmed electrically and can be erased by exposure to ultraviolet light.

Applications:

• Embedded Systems
• Microcontroller Program Storage
• Data Storage for Industrial Equipment
• Firmware Storage
• Legacy Electronic Devices

Features:

• 256 Kbit (32K x 8) memory organization
• CMOS Technology for low power consumption
• Fast Access Time (150ns)
• Single 5V Power Supply
• TTL Compatible Inputs/Outputs
• Programmable and Erasable via UV light

Benefits:

• Provides non-volatile storage for critical data and program code.
• Ensures low power operation, extending battery life in portable devices.
• Enables fast data retrieval with its quick access time.
• Simplifies system design with single 5V power supply requirement.
• Offers compatibility with standard TTL logic circuits.
• Allows for reprogramming and updates by erasing with UV light.

Additional Details:

The D27C256D-15 operates from a single 5V power supply and features TTL-compatible inputs and outputs, making it easy to interface with a wide range of microprocessors and microcontrollers. The memory array is organized as 32,768 bytes of 8 bits each. The access time of 150ns ensures fast data retrieval, which is essential for real-time applications. The device is packaged in a standard DIP (Dual In-Line Package) with a window for UV erasure. The erasure process requires exposure to UV light with a wavelength of 253.7 nm for a specified duration. After erasure, the device can be reprogrammed electrically using a standard EPROM programmer. The D27C256D-15 is a reliable and cost-effective solution for non-volatile memory requirements in various electronic systems.