The D41264V-12X is a 262,144-bit (64K x 4) Dynamic Random Access Memory (DRAM) chip manufactured by NEC. This DRAM is organized as 64K words of 4 bits each. It's a type of volatile memory, meaning it requires constant power to maintain the stored data. The '12X' likely refers to a specific speed grade or revision.

Applications

• Memory in older computer systems: Used as main memory in some early personal computers and workstations.
• Graphics Cards: Could be found as memory in older graphics adapters.
• Printers and Scanners: Used for temporary data storage or buffering in printing and scanning devices.
• Industrial Control Equipment: Potentially used in some industrial controllers or embedded systems of the time.
• Test Equipment: Could be employed in older test and measurement equipment requiring RAM.

Features

• 64K x 4 Organization: Organized as 65,536 words of 4 bits each.
• Dynamic Refresh: Requires periodic refresh cycles to maintain data integrity.
• Fast Access Time: '12X' indicates a specific access time, likely around 120ns (though a datasheet would confirm).
• Single 5V Power Supply: Operates on a single 5-volt power supply.
• TTL Compatibility: Compatible with TTL logic levels.
• Multiplexed Address Inputs: Uses multiplexed row and column addresses to reduce pin count.

Benefits

• Relatively High Density for its time: Provided a significant amount of RAM in a single chip.
• Fast Access Time (for its generation): Provided reasonable speed for many applications.
• Standard Voltage and Interface: Easy to integrate into systems using standard 5V TTL logic.

Additional Details

The D41264V-12X, being a DRAM, requires a refresh circuit to periodically rewrite the data in the memory cells. Without refreshing, the stored data will be lost due to the leakage of charge from the capacitors within the memory cells. The multiplexed address inputs reduce the number of pins required on the chip, which helps to keep the chip size manageable. The specific access time indicated by the '12X' suffix is a key parameter for determining the overall performance of the memory system. Consult the original datasheet for the exact value and other detailed specifications such as refresh rates, power consumption, and timing diagrams. This type of DRAM represents an important step in the evolution of computer memory technology, paving the way for higher-density and faster memory devices.