71321LA25TFGI

Memory IC Overview

The 71321LA25TFGI is a high-speed 16Kb (2K x 8) dual-port static RAM manufactured by Renesas Electronics Corporation. It features asynchronous parallel interface operation with a maximum access time of 25 ns. The device operates on a single 3.0V to 3.6V power supply and supports battery backup data retention down to 2V. It is housed in a 64-pin TQFP surface-mount package and functions as a standalone memory or master port in expanded systems.

Memory IC Feature Summary

• True dual-ported memory cells enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated interrupt logic providing two INT flags for efficient interprocessor communication and status signaling.
• On-chip port arbitration logic with BUSY output flag to manage bus contention during simultaneous access attempts.
• Automatic power-down feature controlled by chip enable signals, allowing entry into low standby power mode.

Memory IC Applications

• Interprocessor communication buffers in multi-CPU architectures
• Master dual-port RAM in 16-bit or wider data bus expansion systems
• High-speed data buffering for real-time signal processing applications

Memory IC Procurement Notes

Verify component authenticity through authorized distributors due to potential counterfeit risks. Confirm RoHS compliance status as older variants may not meet current environmental standards. Check moisture sensitivity level handling requirements prior to assembly. Ensure voltage levels match system specifications strictly.

Memory IC Selection Notes

Select this component when true dual-port simultaneous access is required for 8-bit data paths. Suitable for designs needing integrated interrupt flags for processor coordination. Choose over single-port alternatives when concurrent read/write operations from separate controllers are necessary. Verify package availability matches PCB footprint constraints.

Memory IC Part Context

Part of the 71321 series of dual-port SRAMs designed for high-performance embedded systems. The 'LA' suffix indicates low-voltage operation compatible with 3.3V logic families. This specific model provides a balance of speed and power efficiency for industrial and commercial temperature ranges.

Memory IC Replacement Considerations

The 71321SA55TFI8 is listed as an obsolete upgrade alternative, though it differs in access speed and voltage range. Verify pin compatibility and electrical characteristics before substitution. No direct drop-in replacements with identical performance metrics are confirmed in public documentation.

Memory IC FAQ

Can the 71321LA25TFGI operate at 5V?

No, this specific LA variant is designed for a 3.0V to 3.6V supply range. Standard 5V versions use different suffixes such as SA.

What is the purpose of the BUSY flag?

The BUSY flag indicates when one port is accessing memory that the other port is attempting to access, preventing data corruption through arbitration.