71321SA55TFI8

Memory IC Overview

The Renesas Electronics Corporation 71321SA55TFI8 is a high-speed, asynchronous dual-port static random-access memory (SRAM) device. It features a storage capacity of 16 kilobits organized as 2K by 8 bits. The component supports parallel interface access with a maximum access time of 55 nanoseconds. It operates on a single 5V power supply within a voltage range of 4.5V to 5.5V. The device is housed in a 64-pin Thin Quad Flat Package (TQFP) measuring 10x10 mm. It is designed for industrial temperature ranges from -40°C to +85°C and includes internal interrupt logic for interprocessor communication.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt logic providing two dedicated flags for efficient port-to-port communication and synchronization.
• On-chip arbitration logic manages bus access, featuring a BUSY output flag to indicate active read or write operations.
• Automatic power-down functionality controlled by chip enable signals allows entry into low standby power mode.

Memory IC Applications

• Interprocessor communication between microprocessors requiring fast data exchange.
• Master Dual-Port RAM configuration in systems expanding data bus width using Slave devices.
• Battery-backed memory applications utilizing data retention capabilities at reduced voltages.
• Industrial control systems operating within extended temperature environments.

Memory IC Procurement Notes

This component has reached end-of-life status and is no longer manufactured by Renesas Electronics Corporation. Verification of availability requires checking authorized distributors for remaining stock or obsolete inventory. Procurement should prioritize validated substitute part numbers to ensure long-term supply chain stability and functional compatibility in existing designs.

Memory IC Selection Notes

Select this component when a design requires true dual-port SRAM with integrated interrupt signaling for asynchronous data sharing. Ensure the system accommodates the 64-TQFP package dimensions and 5V logic levels. Verify that the required access speed meets the 55ns specification and that the operating environment falls within the specified industrial temperature range limits.

Memory IC Part Context

The 71321SA series belongs to Renesas' high-speed dual-port SRAM family, originally developed under IDT branding. These devices are engineered for standalone 8-bit operation or as master units in wider bus architectures. The SA suffix denotes commercial/industrial temperature variants, while the LA suffix indicates battery backup support. This specific model represents an older generation asynchronous memory solution.

Memory IC Replacement Considerations

The official upgrade substitute is the 71321LA25TFGI8. This replacement offers improved performance characteristics and updated manufacturing processes. Designers must verify pinout compatibility and electrical parameter alignment before transitioning to the newer component in production assemblies.