71342LA20J

Overview

The Renesas Electronics Corporation 71342LA20J is a high-speed, 32Kb (4K x 8) dual-port static random-access memory (SRAM). It operates asynchronously with a maximum access time of 20ns and supports parallel interfaces. The device functions on a single 5V power supply within the 4.5V to 5.5V range. It features true dual-ported memory cells allowing simultaneous independent access from either port. The component includes an integrated semaphore logic block for hardware-based arbitration between ports. It is housed in a 52-pin PLCC package and supports battery backup operation for data retention.

Feature Summary

• True dual-ported architecture enabling simultaneous independent access to shared memory locations by two separate processors.
• Integrated on-chip semaphore logic block providing hardware support for automatic port arbitration and flag control.
• Fully asynchronous operation from either port, eliminating synchronization requirements between accessing devices.
• Automatic power-down feature controlled by chip enable and semaphore signals to minimize standby power consumption.

Applications

• High-performance computing systems requiring concurrent data access without external arbitration delays.
• Telecommunications equipment utilizing dual-processor architectures for signal processing tasks.
• Industrial automation controllers needing reliable, low-latency shared memory resources.
• Network infrastructure devices managing packet buffering and routing table updates simultaneously.

Procurement Notes

Verify component authenticity through authorized channels due to obsolete status. Confirm package integrity as moisture sensitivity requires proper handling. Check datasheet revisions for any pinout or electrical specification updates. Ensure compatibility with existing system voltage levels before integration. Validate lead-free status if required by specific environmental regulations.

Selection Notes

Select this component when simultaneous bidirectional memory access is critical for system performance. The built-in semaphore logic simplifies design complexity compared to externally arbitrated solutions. Consider the 20ns access speed against system clock requirements. Evaluate the 52-pin PLCC footprint against available PCB space. Assess power consumption needs given the automatic power-down capabilities.

Part Context

This part belongs to the Renesas 71342 series of dual-port SRAMs. It shares architectural similarities with other members like the 71342LA20PFG8 but differs in packaging. The series is designed for applications demanding high-speed, contention-free memory sharing. It represents a legacy solution for systems transitioning from single-port to dual-port architectures.

Replacement Considerations

Public confirmed substitute part numbers include IDT71342LA20J8. Verify pin compatibility and electrical specifications before substitution. Ensure the replacement maintains the same semaphore functionality and access times. Check for any differences in package dimensions or thermal characteristics.