The NEC D41464C-15 is a 65,536 x 4-bit Dynamic Random Access Memory (DRAM). This DRAM chip provides temporary storage and retrieval of data for a variety of electronic systems. It offers a balance between speed, capacity, and cost, making it suitable for numerous applications, especially those prevalent during the 1980s and 1990s.

Applications

• Personal Computers: Used as main memory in older PC systems.
• Graphics Cards: Often used in older graphics cards for frame buffer memory.
• Printers: Incorporated into printer memory for temporary data storage.
• Industrial Equipment: Employed in industrial control systems and automation devices requiring memory.
• Gaming Consoles: Found in early generation video game consoles.

Features

• Memory Capacity: 262,144 bits (65,536 x 4 organization).
• Access Time: 150ns (nanoseconds).
• Refresh Cycle: Requires periodic refresh cycles to maintain data integrity.
• Operating Voltage: Operates on a single +5V power supply.
• Package Type: DIP (Dual In-line Package).
• Multiplexed Addressing: Utilizes multiplexed address inputs to reduce pin count.

Benefits

• Cost-Effective: Offers a balance of performance and cost for memory applications.
• Ease of Integration: The DIP package allows for straightforward insertion into circuit boards.
• Reliable: Provides reliable memory performance when properly implemented with refresh circuitry.
• Wide Compatibility: Compatible with a wide range of digital logic families.
• Established Technology: A mature DRAM technology with readily available documentation.

Additional Details

The D41464C-15, like all DRAMs, is a volatile memory, meaning it loses its stored data when power is removed. Therefore, it requires constant power and periodic refresh cycles to retain the data stored in its memory cells. The 'C' in the part number typically indicates a specific temperature range or production process. The -15 designates the access time, which in this case is 150 nanoseconds, a measure of how quickly the memory can read or write data. The 65,536 x 4 organization means that the memory is organized as 65,536 locations, each capable of storing 4 bits of data. Multiplexed addressing reduces the number of pins required on the chip by using the same address lines for both row and column addresses, requiring external latches to demultiplex the addresses. Proper handling precautions are important to prevent electrostatic discharge (ESD) damage to the chip.