71342SA55PFI8

Overview

The 71342SA55PFI8 is a high-speed dual-port static random-access memory (SRAM) manufactured by Renesas Electronics Corporation. It features a storage capacity of 32Kb organized as 4K x 8 bits with parallel asynchronous interface. The component provides an access time of 55 ns and operates on a single 5V TTL-compatible power supply within the 4.5V to 5.5V range. It is housed in a 64-TQFP surface-mount package and supports an industrial operating temperature range from -40°C to +85°C.

Feature Summary

• True dual-ported memory cells enabling simultaneous independent access to the same memory location from either port without contention.
• Integrated hardware semaphore logic block for automatic arbitration between ports, allowing unassigned flags to be controlled by only one side at any time.
• Automatic power-down feature that reduces standby power consumption when both chip enable signals are high.

Applications

• Systems requiring simultaneous data exchange between two independent processors or controllers.
• High-speed buffering applications where wait states cannot be tolerated.
• Industrial control systems requiring reliable operation across extended temperature ranges.

Procurement Notes

Verify component authenticity through authorized distributors due to discontinuation status. Confirm package integrity and moisture sensitivity level handling procedures before assembly. Check for RoHS compliance requirements as this specific variant may not meet current environmental standards. Validate pin compatibility if substituting into existing designs.

Selection Notes

Select this component when true dual-port functionality with hardware arbitration is required. Ensure system voltage matches the 5V specification. Consider the 64-TQFP package dimensions for PCB layout constraints. Verify thermal management capabilities for the specified industrial temperature range during design phase.

Part Context

This part belongs to the 71342SA/LA series of dual-port SRAMs. It shares architectural similarities with other variants like 71342LA25PFGI but differs in speed grade and package type. The 'SA' designation indicates standard commercial/industrial temperature performance compared to the 'LA' low-power variants.

Replacement Considerations

Official upgrade substitute: 71342LA25PFGI. Verify electrical compatibility and pin mapping before implementation.

FAQ

How does the semaphore logic function?

The on-chip semaphore block allows either port to control specific flags, ensuring only one side accesses shared resources simultaneously to prevent data corruption.

What is the power consumption mode?

The device enters a very low standby power mode automatically when both chip enable signals are held high.