71321SA17TFI

Memory IC Overview

The Renesas 71321SA17TFI is a high-speed 2K x 8 Dual-Port Static RAM featuring internal interrupt logic for interprocessor communications. It operates asynchronously with access times of 17 ns and supports a single 5V ±10% power supply. The device includes on-chip port arbitration, BUSY output flags, and two INT flags for port-to-port communication. It offers automatic power-down modes controlled by CE and provides battery backup operation with 2V data retention. Available in TQFP packages, it supports industrial temperature ranges.

Memory IC Feature Summary

• True dual-ported memory cells allow simultaneous access to the same memory location from both ports without conflict.
• Integrated interrupt logic and flags facilitate direct processor-to-processor communication without external discrete logic.
• On-chip arbitration logic manages bus access, ensuring error-free full-speed operation when cascading with slave devices.
• Automatic power-down feature reduces standby power consumption by controlling on-chip circuitry via the chip enable signal.

Memory IC Applications

• Stand-alone 8-bit dual-port RAM systems
• Master dual-port RAM configurations in 16-bit or wider word width systems
• Interprocessor communication interfaces requiring low-latency data exchange

Memory IC Procurement Notes

Verify package availability as the 71321 series may have limited stock due to age. Confirm RoHS compliance status for specific suffixes. Check for end-of-life notices or last-time-buy dates. Ensure voltage levels match system requirements (5V). Validate temperature range suitability for the target environment before ordering.

Memory IC Selection Notes

Select this component for applications requiring true simultaneous access to shared memory without external arbitration logic. It is suitable for systems needing fast interprocessor signaling via integrated interrupts. Consider the 71421 slave device if expanding bus width to 16 bits or more. Verify package type compatibility with PCB layout constraints.

Memory IC Part Context

The 71321 series belongs to Renesas' legacy dual-port SRAM family, originally developed by IDT. These devices are designed for high-performance embedded systems requiring fast, deterministic memory sharing between multiple processors. The series supports various access speeds and package options to fit diverse industrial and commercial applications.

Memory IC Replacement Considerations

Check for direct pin-compatible replacements within the 71321SA series with different speed grades. Consult Renesas documentation for recommended upgrades to newer microcontroller-integrated solutions if dual-port functionality is no longer strictly required.