71321LA20J

Memory IC Overview

The Renesas Electronics Corporation 71321LA20J is a high-speed 16 kbit (2K x 8) Dual-Port Static Random Access Memory. It features asynchronous parallel interface with a 20 ns access time and operates on a single 5V ±10% power supply ranging from 4.5 V to 5.5 V. The device supports simultaneous independent access to the same memory location via true dual-port cells. It includes internal interrupt logic for interprocessor communication, port arbitration, and battery backup data retention down to 2V. The component is housed in a 52-pin PLCC package.

Memory IC Feature Summary

• True dual-port architecture enabling simultaneous access to identical memory locations without conflict
• Integrated interrupt flags and port-to-port communication logic for efficient interprocessor signaling
• On-chip arbitration and BUSY output flag ensuring error-free operation when expanding bus width
• Battery backup capability maintaining data integrity at voltages as low as 2V

Memory IC Applications

• Interprocessor communication in multi-core or distributed processing systems
• Master Dual-Port RAM configuration paired with SLAVE devices for 16-bit or wider data buses
• High-speed buffering in asynchronous digital signal processing applications

Memory IC Procurement Notes

Verify component authenticity through authorized channels due to potential availability constraints. Confirm RoHS compliance status and moisture sensitivity level prior to storage and handling. Validate that the specific package variant matches design requirements. Check for official product discontinuance notices or lifecycle changes before finalizing procurement plans.

Memory IC Selection Notes

Select this component when simultaneous bidirectional data access is required between two processors. Ensure the system design accommodates the 52-pin PLCC footprint and 5V logic levels. Consider the integrated interrupt features to simplify hardware design compared to discrete dual-port solutions. Verify temperature range compatibility with the intended operational environment.

Memory IC Part Context

The 71321 series represents a family of high-speed dual-port SRAMs designed for complex embedded systems. This specific model integrates master functionality, allowing it to coordinate with slave counterparts for expanded word widths. The inclusion of internal arbitration reduces external logic requirements, streamlining board layout and improving system reliability in demanding computing environments.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical specifications carefully if considering alternative dual-port SRAMs from other manufacturers.