The D27C4001D-15 is a 4 Mbit (512K x 8) CMOS EPROM (Erasable Programmable Read-Only Memory) manufactured by NEC. It is a non-volatile memory device that can be electrically programmed and erased with ultraviolet (UV) light. This EPROM is often used in applications where firmware or data needs to be stored and infrequently updated.

Applications

• Embedded Systems: Storing firmware, boot code, and configuration data in embedded systems.
• Industrial Control Systems: Storing program code and data in programmable logic controllers (PLCs) and other industrial control equipment.
• Networking Equipment: Storing network operating systems and configuration data in routers, switches, and other networking devices.
• Telecommunications Equipment: Storing firmware and configuration data in telecommunications equipment.
• Aerospace Applications: Storing critical data and control programs in aerospace systems.

Features

• High Density: 4 Mbit storage capacity.
• Fast Access Time: 150 ns access time.
• Low Power Consumption: CMOS technology for low power operation.
• UV Erasable: Can be erased with ultraviolet (UV) light.
• Single 5V Power Supply: Operates from a single 5-volt power supply.
• TTL Compatible Inputs/Outputs: Easy interface with TTL logic circuits.

Benefits

• Large Storage Capacity: Provides ample storage for firmware and data.
• High Performance: Fast access time ensures quick data retrieval.
• Low Power Consumption: Reduces power requirements in battery-powered applications.
• Reprogrammability: Allows for firmware updates and data changes.
• Ease of Use: Simple interface simplifies system design.

Additional Details

The D27C4001D-15 is packaged in a ceramic DIP (Dual In-line Package) with a transparent window that allows UV light to erase the memory contents. The erasure process requires exposing the chip to UV light with a specific wavelength and intensity for a certain duration. After erasure, the EPROM can be reprogrammed using a suitable EPROM programmer. The device is organized as 512K x 8 bits, meaning it can store 524,288 bytes of data. The -15 suffix indicates an access time of 150 nanoseconds, which is a critical parameter for determining the speed of data retrieval. Other important parameters include the programming voltage, erase time, and operating temperature range. The datasheet provides detailed information about these parameters and the recommended programming and erasure procedures. This EPROM is suitable for applications requiring a relatively large amount of non-volatile storage and the ability to update the stored data occasionally.