71321LA55PPGI8

Memory IC Overview

The Renesas 71321LA55PPGI8 is a high-speed 16 kbit (2K x 8) dual-port static random-access memory (SRAM). It features true dual-ported memory cells allowing simultaneous access to the same location. The device includes internal interrupt logic for interprocessor communications and on-chip port arbitration. It operates asynchronously with a maximum access time of 55 ns. The component supports a single 5V ±10% power supply, with a voltage range of 4.5 V to 5.5 V. It is housed in a 52-pin TQFP surface-mount package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to shared memory locations by two processors.
• Integrated internal interrupt logic providing two INT flags for efficient port-to-port communication without discrete logic.
• On-chip port arbitration logic manages bus conflicts automatically during simultaneous access attempts.
• Asynchronous operation from either port with automatic power-down capabilities controlled by chip enable signals.

Memory IC Applications

• Interprocessor communication in multi-CPU systems requiring low-latency data exchange.
• Master/Slave dual-port RAM configurations expanding data bus width to 16 bits or more using companion slave devices.
• Battery-backed backup memory systems utilizing 2V data retention capabilities for critical data preservation.

Memory IC Procurement Notes

Verify the specific suffix '8' against official Renesas documentation to confirm if it denotes a specific tape-and-reel packaging variant or environmental compliance status distinct from standard trays. Confirm RoHS compliance and moisture sensitivity level requirements prior to assembly. Ensure the design accommodates the 52-pin TQFP footprint and thermal characteristics for the specified industrial temperature range.

Memory IC Selection Notes

Select this component when simultaneous read/write access to shared memory is required between two processors. It is suitable for applications needing fast asynchronous data transfer without external arbitration logic. Consider the 55 ns access speed and 16 kbit capacity for buffer or FIFO implementations. Verify compatibility with 5V TTL-compatible logic levels and ensure the system design supports the master/slave expansion topology if wider data buses are needed.

Memory IC Part Context

This part belongs to the 71321SA/LA series of dual-port SRAMs manufactured by Renesas Electronics. The 'LA' designation indicates support for battery backup operation with 2V data retention. The series is designed for high-speed parallel interface applications, offering a robust solution for real-time control systems and embedded processing environments requiring reliable shared memory resources.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers for this specific model were not identified in the provided source material. Consult official Renesas documentation for potential upgrades or pin-compatible alternatives.