DP8422AV-25

Controllers Overview

The DP8422AV-25 is a microCMOS programmable dynamic RAM controller and driver manufactured by National Semiconductor. It supports 256k, 1M, and 4M DRAM configurations. The device operates within a voltage supply range of 4.5V to 5.5V and functions at an operating temperature of 0°C to 70°C. It utilizes an 84-LCC (J-Lead) surface-mount package.

Controllers Feature Summary

• Programmable architecture supporting multiple DRAM densities including 256k, 1M, and 4M configurations
• Integrated command scheduling capabilities for optimized memory throughput
• Built-in error correction (ECC) functionality to ensure data integrity

Controllers Applications

• Dynamic RAM management in electronic systems
• Memory controller implementations requiring ECC support
• Embedded systems utilizing 256k/1M/4M DRAM modules

Controllers Procurement Notes

Verify component authenticity as this part is marked obsolete. Confirm the specific suffix matches required speed grades. Ensure compatibility with existing PCB footprints for the 84-LCC J-Lead package. Check for alternative sources due to discontinued status.

Controllers Selection Notes

Select this controller for applications requiring programmable DRAM management with error correction. Verify that the 4.5V to 5.5V supply range aligns with system power rails. Ensure the 84-LCC package fits the mechanical constraints. Consider obsolescence status when planning long-term production.

Controllers Part Context

This component belongs to the National Semiconductor DP8422 series of microCMOS DRAM controllers. It is designed to interface directly with dynamic RAM chips, handling refresh cycles and address multiplexing. The series includes variants with different speed grades and package options.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, direct replacements may require design modifications or adapter solutions.