71421LA5J

Overview

The Renesas Electronics Corporation 71421LA5J is a high-speed, asynchronous dual-port static random-access memory (SRAM) IC. It provides a storage capacity of 16 kilobits organized as 2K words by 8 bits. The device features independent read/write ports for simultaneous data access without bus contention. It operates within a supply voltage range of 4.5V to 5.5V and supports an access time of 55 nanoseconds. The component is housed in a 52-lead Plastic Leadless Chip Carrier (PLCC) package with dimensions of 19.13mm x 19.13mm. It is designed for surface mount installation and functions reliably within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Dual-port architecture enabling independent simultaneous read and write operations on separate ports.

Applications

• Interprocessor communication systems requiring shared memory buffers.
• Master-slave dual-port RAM configurations for expanded word width systems.
• High-speed data buffering in embedded processing applications.

Procurement Notes

Verify the specific suffix J indicates the PLCC-52 package configuration. Confirm RoHS compliance status as historical data suggests potential non-compliance. Check current availability as the product may be discontinued or subject to limited supply constraints. Ensure the design accommodates the required 4.5V to 5.5V power supply rails and 55ns timing requirements.

Selection Notes

Select this component when independent dual-port access is required for concurrent processor interactions. The 55ns speed suits moderate-speed parallel interfaces. Consider the 52-pin PLCC footprint for PCB layout compatibility. Evaluate alternatives if higher density or single-port simplicity suffices. Verify thermal management capabilities for the specified operating temperature range.

Part Context

This part belongs to the 71421LA series of dual-port SRAMs from Renesas. It complements devices like the 71321LA in master-slave configurations to create wider memory buses. The series is characterized by internal interrupt logic for efficient interprocessor signaling. It serves as a standalone 8-bit solution or integrates into larger multi-chip memory arrays.

Replacement Considerations

Cross-reference with IDT71421LA5J for pin-compatible substitution. Verify electrical parameters match the 55ns access time and 5.5V maximum rating. Ensure the replacement supports the same PLCC-52 package geometry and asynchronous operation mode.