71421LA20PFG

Overview

The Renesas 71421LA20PFG is a high-speed, asynchronous dual-port static random-access memory (SRAM) with a 16Kb capacity organized as 2K words by 8 bits. It operates on a single 5V ±10% power supply and features true dual-ported memory cells allowing simultaneous access to the same location. The device includes internal interrupt logic for interprocessor communication and on-chip port arbitration. It supports battery backup operation with data retention down to 2V and offers an automatic power-down mode controlled by chip enable signals.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access from two ports without conflict.
• Integrated interrupt flags and port-to-port communication logic for efficient interprocessor signaling.
• On-chip arbitration logic manages bus conflicts during simultaneous access attempts.
• Battery backup capability ensures data retention at voltages as low as 2V.

Applications

• Interprocessor communication in multiprocessor systems
• High-speed data buffering between asynchronous components
• Master-slave dual-port RAM configurations for expanded data buses

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm package integrity and lead condition before integration. Check RoHS compliance requirements against project specifications as this specific variant may not meet current environmental standards. Validate pin compatibility with existing PCB footprints.

Selection Notes

Select this component when simultaneous bidirectional data access is required without external arbitration logic. Suitable for applications needing fast interprocessor signaling via built-in interrupt flags. Consider voltage tolerance and temperature range constraints relative to system environment. Evaluate power consumption needs given the standby mode capabilities.

Part Context

Part of the 71321/71421 family of dual-port SRAMs designed for standalone or master-slave configurations. The LA suffix indicates industrial temperature range availability and battery backup support. This series eliminates discrete logic for bus arbitration, simplifying system design for high-performance embedded applications requiring reliable parallel memory interfaces.

Replacement Considerations

Check datasheet for pin-compatible alternatives within the same family. Verify electrical parameters match original requirements. Ensure interrupt logic and arbitration features are present in substitutes. Confirm package dimensions align with existing board layout constraints.