71321SA17JI

Memory IC Overview

The 71321SA17JI is a high-speed dual-port static RAM with an internal interrupt logic for interprocessor communications. It features 16Kbit of memory organized as 2K x 8, providing a compact solution for embedded systems. The device operates asynchronously with a maximum access time of 17 ns and supports a single 5V ±10% power supply. It utilizes a 52-pin PLCC package (19.13x19.13 mm) designed for surface mount installation. The component functions within a commercial temperature range of 0°C to 70°C.

Memory IC Feature Summary

• True dual-ported memory cells allow simultaneous independent access to the same memory location from both ports without conflict.
• Integrated interrupt logic provides two INT flags for efficient port-to-port communication and status signaling between processors.
• Automatic power down feature controlled by chip enable signals allows on-chip circuitry to enter a low standby power mode.
• On-chip arbitration logic manages bus access, enabling expansion to 16-bit or wider data buses when paired with compatible slave devices.

Memory IC Applications

• Interprocessor communication in multi-core or distributed processing architectures
• Stand-alone 8-bit dual-port RAM implementation in embedded controllers
• Master dual-port RAM configuration in 16-bit or wider word width systems

Memory IC Procurement Notes

Verify RoHS compliance status carefully, as this specific part number may not meet current environmental directives. Confirm package dimensions match the 52-PLCC specification exactly. Check for obsolescence notices or last-time buy notifications from Renesas. Ensure voltage levels align with the 4.5V to 5.5V operating range. Validate that the 17 ns speed grade meets system timing requirements.

Memory IC Selection Notes

Select this component when simultaneous read/write access to shared memory is required without external arbitration logic. Choose the 17 ns variant if faster cycle times are needed compared to standard 20 ns or 25 ns options. Consider the PLCC package only if the PCB layout supports 52-pin surface mount footprints. Evaluate the 71421 series if 16-bit data width expansion is necessary for the application architecture.

Memory IC Part Context

This device belongs to the 71321/71421 family of high-speed dual-port SRAMs manufactured by Renesas Electronics. The family includes variants with different access speeds and packages, such as the 7132LA series for industrial temperatures. These components are designed to replace older bipolar dual-port memories with lower power CMOS alternatives while maintaining compatibility with existing system interfaces.

Memory IC Replacement Considerations

The IDT7132SA series serves as a functional equivalent within the same product family. Verify pinout compatibility and electrical specifications before substitution. Note that industrial temperature variants like the 71321LA series offer extended thermal ranges but may differ in package availability.