71342LA55J8

Overview

The Renesas Electronics Corporation 71342LA55J8 is a high-speed, 32-kbit (4K x 8) dual-port static random-access memory. It features fully asynchronous operation with independent access from either port and includes on-chip semaphore logic for hardware arbitration. The device operates on a single 5V TTL-compatible power supply within a 4.5V to 5.5V range. It supports battery backup data retention at 2V and is available in a 52-pin PLCC package.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from both ports.
• Integrated hardware semaphore signaling block for automatic arbitrating between ports without software intervention.
• Automatic power-down feature controlled by chip enable and semaphore signals to achieve very low standby power mode.

Applications

• High-speed data buffering in telecommunications systems
• FIFO buffer applications requiring independent read/write ports
• Dual-processor cache memory architectures

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential availability of obsolete or refurbished units. Confirm RoHS compliance status as older variants may not meet current environmental standards. Validate package integrity and pin configuration against the 52-PLCC specification before integration into PCB designs.

Selection Notes

Select this component when simultaneous independent access to shared memory is required without external arbitration logic. Ensure the design accommodates the 52-pin PLCC footprint and meets the 4.5V to 5.5V voltage requirements. Consider the asynchronous interface timing characteristics for system clock synchronization.

Part Context

This part belongs to the Renesas 71342 series of dual-port SRAMs, designed for applications needing high-speed concurrent access. The 'LA' suffix typically denotes industrial temperature range capabilities, while 'J8' indicates the specific 52-pin PLCC package variant. It serves as a specialized memory solution for complex embedded systems.

Replacement Considerations

Public confirmed substitute: IDT71342LA55J8. Verify electrical compatibility and pinout correspondence before substitution.