71321LA55PF

Memory IC Overview

The Renesas Electronics Corporation 71321LA55PF is a high-speed, asynchronous dual-port static random-access memory (SRAM) device. It features a storage capacity of 16 kilobits organized as 2K words by 8 bits. The component supports parallel interface operation with an 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) with dimensions of 14x14 mm. It includes internal interrupt logic for interprocessor communication and supports industrial temperature ranges.

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 INT flags for efficient port-to-port communication and synchronization.
• Automatic power-down functionality controlled by chip enable signals to minimize standby power consumption during idle periods.
• On-chip arbitration logic that facilitates expansion to 16-bit or wider data bus widths when paired with compatible slave devices.

Memory IC Applications

• Interprocessor communication links between microprocessors requiring low-latency data exchange.
• Master dual-port RAM configurations in systems expanding data bus width using slave SRAM components.
• Battery-backed memory applications utilizing the LA series' 2V data retention capability for critical data preservation.
• Industrial control systems operating within extended temperature environments requiring reliable asynchronous memory access.

Memory IC Procurement Notes

Verify component authenticity through authorized distributors due to potential obsolescence status. Confirm RoHS compliance requirements as older batches may not meet current environmental standards. Check for moisture sensitivity level handling precautions during assembly. Validate package integrity upon receipt to ensure pin alignment matches the 64-TQFP specification before soldering.

Memory IC Selection Notes

Select this component when simultaneous bidirectional memory access is required without external arbitration logic. Choose the LA variant over SA if battery backup support down to 2V is necessary for data retention. Ensure the system design accommodates the 55ns access speed and 64-pin TQFP footprint. Verify compatibility with existing master-slave architectures if expanding bus width beyond 8 bits.

Memory IC Part Context

This part belongs to the 71321 family of dual-port SRAMs manufactured by Renesas Electronics. It serves as a standalone 8-bit memory or a master unit in 16-bit systems. The LA suffix indicates industrial temperature range availability and specific power characteristics compared to other variants. It replaces earlier generations while maintaining functional compatibility with established dual-port protocols.

Memory IC Replacement Considerations

Consider the 71321LA20PFG8 for faster 20ns access times if timing constraints allow. Verify pinout compatibility when substituting with other 64-pin TQFP SRAMs. Check if the replacement supports the required interrupt logic and dual-port arbitration features essential for the application.