71321SA20J8

Memory IC Overview

The Renesas Electronics Corporation 71321SA20J8 is a high-speed, asynchronous dual-port static random-access memory (SRAM) device. It features a storage capacity of 16 kbit organized as 2K x 8 bits. The component provides a maximum access time of 20 ns and operates on a single 5V ±10% power supply, with voltage specifications ranging from 4.5 V to 5.5 V. It utilizes a parallel interface and includes internal interrupt logic for interprocessor communications. The device is housed in a 52-pin PLCC package and supports surface-mount installation.

Memory IC Feature Summary

• True dual-ported memory cells allow simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt logic generates two INT flags to facilitate direct port-to-port communication between processors.
• On-chip port arbitration logic manages bus access, providing a BUSY output flag to indicate when the memory is busy.
• Automatic power-down feature controlled by chip enable signals allows circuitry to enter low standby power mode.

Memory IC Applications

• Interprocessor communication in multi-processor systems
• Stand-alone 8-bit dual-port RAM applications
• Master dual-port RAM configuration with 71421 Slave devices for expanded data bus widths

Memory IC Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm RoHS compliance requirements as indicated by manufacturer documentation. Check humidity sensitivity handling procedures before assembly. Validate pin compatibility with existing PCB footprints. Review technical resources for any package or labeling changes documented in product change notices.

Memory IC Selection Notes

Select this component when simultaneous bidirectional data access is required without external arbitration logic. Ensure system design accommodates the 52-pin PLCC package dimensions. Verify that the 20 ns access speed meets timing constraints. Consider the 0°C to +70°C operating temperature range for environmental suitability. Evaluate interrupt logic integration needs for processor synchronization.

Memory IC Part Context

The 71321SA20J8 belongs to the Renesas 71321 series of dual-port SRAMs. This series is designed for high-speed data buffering and sharing between microprocessors. The SA suffix indicates specific speed and package variations within the family. Related parts include variants with different access times and packages, such as the 71321LA series.

Memory IC Replacement Considerations

The 71321LA20PFG8 is listed as an upgrade alternative. Verify package differences between PLCC-52 and TQFP-64 formats. Check if interrupt logic and electrical characteristics remain compatible with existing designs.