71321LA25PFGI8

Memory IC Overview

The 71321LA25PFGI8 is a high-speed, asynchronous dual-port static random-access memory (SRAM) manufactured by Renesas Electronics Corporation. It features a storage capacity of 16 kilobits organized as 2K words by 8 bits. The device supports simultaneous independent access to the same memory location from two separate ports, facilitating efficient interprocessor communication without external arbitration logic. It operates on a single 5V power supply with a specified voltage range of 4.5V to 5.5V and includes an automatic power-down feature for low standby consumption. The component is housed in a 64-pin Thin Quad Flat Package (TQFP) with a 10x10mm body size.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous read/write access to identical addresses from both ports
• Integrated internal interrupt logic providing two dedicated flags for direct port-to-port signaling
• On-chip arbitration logic manages bus conflicts automatically, eliminating the need for discrete control circuitry
• Supports expansion to 16-bit or wider data buses when paired with compatible slave devices

Memory IC Applications

• Interprocessor communication links between microprocessors and digital signal processors
• Master-slave memory configurations for expanding system data bus width beyond 8 bits
• High-speed buffering in real-time data acquisition systems requiring concurrent access
• Battery-backed memory applications utilizing low-voltage retention capabilities

Memory IC Procurement Notes

Verify that the specific suffix PFGI8 corresponds to the required package dimensions and temperature rating. Confirm RoHS compliance status against current manufacturer declarations, as legacy variants may differ. Ensure the design accommodates the 64-pin TQFP footprint and thermal requirements. Cross-reference the datasheet revision history for any pinout or electrical characteristic updates prior to finalizing procurement orders.

Memory IC Selection Notes

Select this component when simultaneous bidirectional data exchange is required without external bus controllers. It is suitable for designs needing fast, deterministic access times with integrated handshake signals. Consider the 5V operating voltage requirement and ensure compatibility with the host system's logic levels. Evaluate the 64-pin package constraints against available board space and routing density.

Memory IC Part Context

This part belongs to the 71321 series of dual-port SRAMs, which are designed for high-performance parallel interface applications. The 'LA' designation typically indicates industrial temperature range availability and specific voltage retention characteristics compared to standard SA variants. The series is engineered to replace complex discrete logic solutions in multi-processor architectures.

Memory IC Replacement Considerations

• 71321LA20PFG8
• 71321LA25TFGI8

Memory IC FAQ

How does the device handle simultaneous access to the same memory address?

The 71321LA25PFGI8 utilizes true dual-ported memory cells that allow both Port A and Port B to access the same location simultaneously without conflict, managed by internal arbitration logic.

What is the function of the INT flags?

The two internal interrupt flags provide a hardware mechanism for one port to signal the other, facilitating efficient interprocessor communication without software polling.