71342SA25PF8

Overview

The 71342SA25PF8 is a high-speed 32Kb (4K x 8) dual-port static RAM manufactured by Renesas Electronics Corporation. It features fully asynchronous parallel operation with a 25 ns access time and write cycle time. The device operates on a single 5V power supply within the 4.5V to 5.5V range and supports an industrial temperature range of -40°C to +85°C. It is housed in a 64-pin TQFP package.

Feature Summary

• True dual-ported memory cells enabling simultaneous independent access to the same memory location from either port.
• Integrated hardware semaphore logic block for automatic arbitration and signaling between ports without discrete components.
• Automatic power-down feature controlled by chip enable and semaphore signals to achieve very low standby power consumption.

Applications

• High-speed data buffering in telecommunications equipment
• Network switch and router packet storage
• Industrial control systems requiring concurrent processor access

Procurement Notes

This component is officially discontinued and no longer manufactured by Renesas Electronics Corporation. Verification of availability should focus on approved upgrade alternatives such as the 71342LA25PFGI8 series. Confirm that replacement parts meet original RoHS compliance requirements, as the legacy part does not comply with current environmental standards.

Selection Notes

Select this component for designs requiring true dual-port architecture with hardware-based semaphore arbitration. Ensure the system utilizes a single 5V TTL-compatible supply. Verify that the 64-TQFP package dimensions fit the PCB layout constraints and that the 25 ns speed meets the timing requirements of the target application interface.

Part Context

The 71342SA25PF8 belongs to the 71342SA family of dual-port SRAMs. This family provides high-density memory solutions with independent port access. The 'SA' designation indicates standard commercial or industrial variants, while suffixes define package types and speed grades within the broader product line.

Replacement Considerations

The official upgrade substitute is the 71342LA25PFGI8. Verify pin compatibility and electrical specifications before integration. Note that the LA series may have different environmental compliance status compared to the SA series.

FAQ

Does the 71342SA25PF8 support battery backup?

No, battery backup operation is only available in the LA variant of the 71342 family. The SA series does not support this feature.

How is arbitration handled between the two ports?

Arbitration is managed by an on-chip hardware semaphore logic block. This allows unassigned flags to be accessed by either side, with only one side controlling the flag at any given time.