The OKI/Metcal M514256B-70Z is a high-speed, 262,144-word x 4-bit Dynamic Random Access Memory (DRAM). It's designed for applications requiring fast access times and moderate memory capacity.

Applications:

• Personal Computers: Used as main memory in older PC systems.
• Graphics Cards: Can be found in older graphics cards as frame buffer memory.
• Embedded Systems: Suitable for embedded applications needing fast access to a moderate amount of memory.
• Printers: Utilized in printer buffers for temporary data storage.
• Industrial Control Systems: Employed in control systems requiring rapid data processing.

Features:

• Organization: 262,144 words x 4 bits
• Access Time: 70ns access time, indicating high-speed performance.
• Operating Voltage: Typically operates at 5V.
• Refresh: Requires periodic refresh cycles to maintain data integrity.
• Package: Available in standard DIP or SOJ packages for easy integration.

Benefits:

• High Speed: 70ns access time ensures fast data retrieval and processing.
• Moderate Capacity: Provides sufficient memory for many embedded and older PC applications.
• Easy Integration: Standard package options simplify integration into existing systems.
• Reliable Performance: Designed for stable and consistent operation.
• Cost-Effective: Represents a cost-effective memory solution for legacy systems and specific applications.

Additional Details:

The M514256B-70Z is a page-mode DRAM, which allows for faster access to data within the same row. It supports read, write, and refresh operations. It utilizes multiplexed address inputs to reduce the number of address pins required. It's crucial to consult the datasheet for specific timing requirements, power consumption, and refresh procedures to ensure proper operation and prevent data loss. The device is sensitive to static discharge, so proper handling precautions are necessary during installation and maintenance. The device is now likely obsolete but may be useful for repairs of legacy equipment.