The HM514256AZP-6 is a 262,144-word x 4-bit Dynamic RAM (DRAM) manufactured by Hitachi. It's designed for applications requiring moderate-density memory with relatively fast access times. It was commonly used in computer systems, graphics cards, and other memory-intensive applications during its production era.

Applications

• Computer main memory
• Graphics card memory
• Video game consoles
• Printers
• Industrial control systems

Features

• Organization: 262,144 words x 4 bits
• Access time: 60ns
• Single 5V power supply
• TTL compatible inputs and outputs
• Refresh required: Dynamic RAM requires periodic refresh cycles to maintain data.
• Package: ZIP (Zig-zag In-line Package)

Benefits

• Moderate memory capacity: Provides sufficient memory for many embedded and general-purpose applications.
• Relatively fast access time: Allows for quick data retrieval, improving system performance.
• Easy integration: TTL compatible I/O simplifies interfacing with other digital circuits.
• Cost-effective: DRAM technology provides a cost-effective solution for memory requirements.
• Compact Package: ZIP package allows for dense memory packaging.

Additional Details

The HM514256AZP-6 requires periodic refresh cycles to maintain stored data, as is typical for DRAM devices. The ZIP (Zig-zag In-line Package) allowed for higher memory density on circuit boards. The refresh cycles are crucial to prevent data loss and ensure reliable operation. The DRAM is operated using address lines, control signals (RAS, CAS, WE), and data input/output lines. While now obsolete, this DRAM was a crucial part of the evolution of computer memory technology.