71342LA35J

Overview

The Renesas Electronics Corporation 71342LA35J is a high-speed 4K x 8 dual-port static random-access memory (SRAM) device. It features fully asynchronous operation from either port and includes on-chip hardware semaphore logic for arbitration between ports. The component operates with a TTL-compatible single 5V power supply, supporting battery backup data retention at 2V. It is available in industrial temperature ranges and utilizes true dual-ported memory cells allowing simultaneous access to the same location.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to shared memory locations from both ports.
• Integrated semaphore signaling block providing full on-chip hardware support for arbitrating access between the two ports.
• Automatic power-down feature controlled by chip enable and semaphore signals to achieve very low standby power modes.

Applications

• High-speed data buffering in real-time processing systems
• Network switch memory buffers requiring concurrent port access
• Industrial equipment control systems operating in harsh environments

Procurement Notes

Verify component authenticity through authorized channels as this part may be subject to obsolescence or limited availability. Confirm package type and suffix designations match specific application requirements. Check datasheet revisions for any updates regarding moisture sensitivity levels or lead-free status before integration into production designs.

Selection Notes

Select this component when simultaneous bidirectional access to shared memory is required without external arbitration logic. Ensure system voltage tolerances align with the specified 5V supply range. Consider the industrial temperature rating if the deployment environment exceeds standard commercial limits. Verify that the semaphore interface meets the protocol requirements of the connected processors.

Part Context

This device belongs to the IDT/Renesas 71342 family of dual-port SRAMs. It shares architectural similarities with other members like the 71342SA/LA series but differs in speed grades and package options. The LA suffix typically denotes specific temperature or packaging variations within the broader product line.

Replacement Considerations

Direct substitutes include other 4K x 8 dual-port SRAMs with compatible pinouts and semaphore functionality. Verify electrical specifications such as access time and power consumption against original requirements. Cross-reference package dimensions to ensure mechanical compatibility during replacement.