71321SA25JI8

Memory IC Overview

The 71321SA25JI8 is a high-speed dual-port static random access memory manufactured by Renesas Electronics. It features a storage capacity of 16 kbit organized as 2K x 8 bits with an asynchronous parallel interface. The component supports a supply voltage range of 4.5V to 5.5V and offers a maximum access time of 25 ns. It operates within a temperature range of -40°C to +85°C and is housed in a 52-pin PLCC package.

Memory IC Feature Summary

• True dual-ported memory cells enabling simultaneous independent access to the same memory location from both ports.
• Integrated internal interrupt logic providing two INT flags for direct port-to-port communication without external discrete logic.
• On-chip port arbitration logic with BUSY output flag to manage concurrent access conflicts automatically.
• Automatic power-down feature controlled by chip select signals, allowing entry into low standby power mode.

Memory IC Applications

• Interprocessor communications requiring fast data exchange between multiple processors.
• Master/Slave dual-port RAM configurations expanding data bus width to 16 bits or more.
• Battery backup systems utilizing low-power operation modes for extended retention.

Memory IC Procurement Notes

Verify end-of-life status before design finalization, as this component may be discontinued. Confirm RoHS compliance requirements against specific project standards, noting potential non-compliance with current regulations. Ensure the 52-PLCC package footprint matches the target PCB layout. Validate that the 4.5V to 5.5V supply voltage aligns with system power rails. Check for available replacement alternatives if long-term supply stability is required.

Memory IC Selection Notes

Select this component when true dual-port functionality with integrated arbitration is necessary. It is suitable for applications requiring simultaneous read/write access from two independent masters. Consider the 25 ns access speed for high-performance asynchronous interfaces. Ensure the system supports the 5V TTL-compatible logic levels. Verify that the industrial temperature range meets environmental operating conditions.

Memory IC Part Context

This part belongs to the 71321 series of dual-port SRAMs designed for high-speed interprocessor communication. It serves as a standalone 8-bit dual-port RAM or as a master device paired with slave counterparts like the 71421. The series emphasizes error-free full-speed operation without additional discrete logic for bus arbitration.

Memory IC Replacement Considerations

Check for official substitute part numbers from Renesas or IDT if this component is unavailable. Verify pin compatibility and electrical specifications before substituting. Ensure the alternative maintains dual-port architecture and interrupt logic features.