71321LA55JI8

Memory IC Overview

The Renesas Electronics Corporation 71321LA55JI8 is a high-speed static random access memory component belonging to the 71321 series. It features a storage capacity of 16 kbit organized as 2k x 8 bits with an access time of 55 ns. The device operates on a single 5V power supply ranging from 4.5 V to 5.5 V, with a maximum power consumption of 140 mA. It supports parallel interface communication and functions as a dual-port SRAM. The component is housed in a 52-pin PLCC package designed for surface mount installation. It is rated for an industrial operating temperature range between -40°C and +85°C.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location by two processors without conflict.
• Integrated internal interrupt logic providing two INT flags for direct port-to-port communication and synchronization.
• On-chip port arbitration logic manages bus access conflicts automatically, eliminating the need for external discrete logic components.
• Automatic power-down feature controlled by chip enable signals allows circuitry to enter low standby power mode.

Memory IC Applications

• Interprocessor communications in multi-core or distributed processing systems
• Master Dual-Port RAM configuration in 16-bit or wider data bus expansion systems
• High-speed asynchronous data buffering between independent processor domains

Memory IC Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm RoHS compliance requirements against specific project standards as older batches may differ. Validate pin compatibility with existing PCB footprints before integration. Check for moisture sensitivity level handling requirements during storage and assembly processes.

Memory IC Selection Notes

Select this part when true dual-port capability with integrated interrupt signaling is required for 8-bit wide applications. Ensure system voltage aligns with the 4.5V to 5.5V operational range. Consider the 55 ns access speed against timing constraints. Verify that the 52-pin PLCC package fits the mechanical design constraints of the target enclosure.

Memory IC Part Context

This component belongs to the Renesas 71321 series of high-speed dual-port SRAMs. It serves as a standalone 8-bit memory solution or acts as a master unit when paired with slave devices like the 71421 series for expanded word widths. The series emphasizes error-free operation without additional discrete logic, targeting complex embedded control environments requiring reliable inter-processor data exchange.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the end-of-life status, verify if newer variants within the extended family offer compatible pinouts and electrical specifications before considering alternatives.