71421LA20PF

Overview

The Renesas Electronics Corporation 71421LA20PF is a 16Kb (2K x 8) dual-port static random-access memory (SRAM). It features asynchronous parallel interface operation with a maximum access time of 20 ns. The device operates on a single 5V ±10% power supply, ranging from 4.5V to 5.5V. It utilizes true dual-ported memory cells allowing simultaneous access to the same location and includes internal interrupt logic for interprocessor communication. The component is housed in a 64-pin TQFP package.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to identical memory locations by both ports without conflict.
• Integrated internal interrupt logic providing two INT flags for efficient port-to-port communication and synchronization.
• On-chip port arbitration logic manages bus conflicts automatically, eliminating the need for external discrete logic components.
• Supports battery backup operation with data retention down to 2V, ensuring data integrity during primary power loss.

Applications

• Interprocessor communication buffers in multi-core or multi-microcontroller systems
• High-speed data buffering between asynchronous system components
• Master/Slave dual-port RAM configurations for expanding data bus width to 16 bits or more
• Real-time signal processing applications requiring concurrent read/write operations

Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence notices. Confirm package marking and datasheet revision match the specific lot requirements. Check for RoHS compliance status as older variants may not meet current environmental regulations. Ensure storage conditions adhere to moisture sensitivity level specifications to prevent package damage during soldering.

Selection Notes

Select this component when simultaneous bidirectional data access is required without external arbitration hardware. The 20 ns speed suits high-frequency digital interfaces. Consider the 64-TQFP package for surface-mount assembly constraints. Verify that the 5V logic levels align with the host system's I/O voltage requirements. Evaluate the interrupt flag functionality against the system's synchronization protocol needs.

Part Context

This device belongs to the 71421LA series of dual-port SRAMs manufactured by Renesas Electronics. It is functionally compatible with earlier IDT equivalents under the same naming convention. The LA suffix indicates industrial temperature range availability and specific battery backup characteristics. It serves as a standalone 8-bit memory or as a slave unit paired with 71321 master devices.

Replacement Considerations

• IDT71421LA20PF