71321LA25JI8

Memory IC Overview

The Renesas Electronics Corporation 71321LA25JI8 is a high-speed 16Kbit (2K x 8) Dual-Port Static RAM featuring internal interrupt logic for interprocessor communications. It operates asynchronously with a maximum access time of 25 ns and supports a single 5V ±10% power supply within a voltage range of 4.5 V to 5.5 V. The device utilizes true dual-ported memory cells allowing simultaneous access to the same location, includes on-chip port arbitration, and provides BUSY output flags. It is housed in a 52-pin PLCC package and supports industrial temperature ranges.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to shared memory locations by two processors.
• Integrated internal interrupt logic with dedicated INT flags facilitating direct port-to-port communication without external discrete logic.
• On-chip port arbitration logic combined with BUSY output flags to manage data bus contention and ensure error-free operation.
• Automatic power-down feature controlled by chip enable signals to reduce standby power consumption.

Memory IC Applications

• Interprocessor communication links between microprocessors or digital signal processors.
• Master Dual-Port RAM configurations expanding data bus width when paired with compatible slave devices.
• High-speed buffering applications requiring concurrent read/write operations from separate system buses.
• Battery-backed systems utilizing low-voltage retention capabilities for data preservation during power loss.

Memory IC Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence notices. Confirm package integrity and moisture sensitivity levels prior to assembly. Check for specific end-of-life documentation or replacement recommendations from the manufacturer. Ensure compatibility with existing system voltage requirements and interface protocols before procurement.

Memory IC Selection Notes

Select this component for designs requiring asynchronous dual-port memory with integrated signaling. Consider the 25 ns access speed and 52-pin PLCC form factor for space-constrained industrial applications. Evaluate the need for internal interrupt logic versus external arbitration. Verify that the operating temperature range meets environmental specifications.

Memory IC Part Context

This device belongs to the 71321 series of high-speed Dual-Port SRAMs designed for standalone or master-slave configurations. It complements other variants in the family offering different access times and package options. The series emphasizes simplified system design by eliminating external control logic for port arbitration and communication.

Memory IC Replacement Considerations

Consult official datasheets for pin-compatible alternatives within the same series. Verify functional equivalence regarding interrupt logic and arbitration features. Check for updated manufacturing sources if original production has ceased.