The NEC D431000ACW-85LL is a 1,048,576-bit (1Mbit) Dynamic RAM (DRAM) organized as 128K words x 8 bits. It is a DRAM that requires periodic refresh to maintain the data stored in its memory cells. This memory chip was widely used in various electronic devices requiring temporary storage and retrieval of data.

Applications

• Personal Computers: Used as main memory (RAM) in older PCs and workstations.
• Printers: Employed in printer buffer memory for storing print jobs.
• Graphics Cards: Utilized as video RAM (VRAM) in graphics adapters.
• Industrial Control Systems: Integrated into industrial automation equipment.
• Embedded Systems: Found in embedded applications requiring moderate amounts of RAM.

Features

• Memory Capacity: 1,048,576 bits (1Mbit), organized as 128K x 8 bits.
• Access Time: 85ns (nanoseconds).
• Refresh Cycle: Requires periodic refresh cycles.
• Operating Voltage: +5V single power supply.
• Package: DIP (Dual In-line Package).
• Low Power Consumption: LL indicates low power version.

Benefits

• Suitable for Retro Computing: Ideal for restoring and maintaining older computer systems.
• Easy to Use: Standard DIP package facilitates easy integration into existing circuits.
• Reliable Performance: Delivers stable and reliable memory performance.
• Low Power: LL version provides reduced power consumption compared to standard versions.
• Good Storage Capacity: Offers a reasonable memory capacity for its time.

Additional Details

As a DRAM, the D431000ACW-85LL is a volatile memory, meaning it requires constant power to retain the data stored in its memory cells. It employs a refresh cycle mechanism to periodically rewrite the data, preventing data loss due to capacitor leakage. The 'ACW' in the part number likely refers to the package type or specific manufacturing process used by NEC. The '-85' denotes the access time of 85 nanoseconds. The 128K x 8 organization signifies that the memory is structured as 128,000 memory locations, each capable of holding 8 bits (one byte) of data. The LL suffix indicates a low-power version, meaning it consumes less power than standard versions of the same memory chip. This makes it suitable for battery-powered devices or applications where power consumption is a critical factor.