The UPD41256L-15 is a 262,144-bit Dynamic RAM (DRAM) from NEC. It's organized as 256K x 1 bit, providing a memory solution for various applications. This DRAM is designed for systems requiring cost-effective memory, making it suitable for use in older computer systems, embedded systems, and other memory-dependent applications where density and speed requirements are moderate.

Applications

• Older computer systems
• Embedded systems
• Video game consoles (older generations)
• Memory expansion cards

Features

• 262,144-bit (256K x 1) capacity
• Single +5V power supply
• Access time: 150ns
• TTL compatible inputs and outputs
• Refresh cycle: 512 cycles / 8ms
• 3-state output

Benefits

• Cost-Effective Memory: Provides a relatively low-cost memory solution for applications where high speed is not critical.
• Easy to Integrate: TTL compatible I/O simplifies interfacing with other digital components.
• Standard Refresh: Requires standard refresh cycles for data retention.
• Single Power Supply: Operates on a single +5V power supply, simplifying power supply design.

The UPD41256L-15 DRAM requires a refresh cycle to maintain data. The refresh cycle is typically 512 cycles every 8 milliseconds. This means that each row of the memory array must be accessed or refreshed within the 8ms period to prevent data loss. The device features a 3-state output, which allows multiple memory chips to be connected to the same data bus. The UPD41256L-15 is available in a standard DIP (Dual In-Line Package), making it easy to socket or solder onto printed circuit boards. It's an older generation DRAM, so its use is generally limited to legacy systems or applications where its specifications are sufficient and cost is a primary concern.