71321SA55JG8

Memory IC Overview

The 71321SA55JG8 is a high-speed dual-port static random access memory (SRAM) manufactured by Renesas Electronics. 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 within a voltage range of 4.5 V to 5.5 V, drawing a maximum current of 155 mA. It utilizes a parallel interface and is housed in a 52-pin PLCC package suitable for surface mount technology. The component supports asynchronous operation from either port and includes internal interrupt logic for interprocessor communications.

Memory IC Feature Summary

• True dual-ported memory cells enabling simultaneous access to the same memory location from both ports without conflict.
• Integrated interrupt flags facilitate direct port-to-port communication, eliminating the need for additional discrete logic for basic signaling.
• On-chip port arbitration logic manages bus access, ensuring error-free full-speed operation when used as a master unit.
• Automatic power-down feature controlled by chip enable signals allows circuitry to enter low standby power mode.

Memory IC Applications

• Interprocessor communication links in embedded systems requiring fast data exchange between microcontrollers.
• Master dual-port RAM configurations expanding data bus width to 16 bits or more when paired with slave devices.
• Real-time engine applications needing high-speed asynchronous memory access for industrial equipment control.

Memory IC Procurement Notes

This component is officially classified as obsolete and no longer manufactured by Renesas Electronics. Verification of availability is restricted to existing distributor stock or surplus markets. Buyers must confirm authenticity through authorized channels due to the end-of-life status. Supply continuity cannot be guaranteed, and lead times vary significantly based on third-party inventory levels rather than factory production schedules.

Memory IC Selection Notes

Engineers should evaluate this part only if legacy system compatibility requires the specific 71321 series architecture. The 55 ns access time and 5V TTL-compatible interface define its operational envelope. Designers must account for the 52-pin PLCC footprint during PCB layout. Since the device is discontinued, alternative solutions with modern packaging or lower power consumption should be considered for new designs to ensure long-term supply stability.

Memory IC Part Context

The 71321SA55JG8 belongs to the 71321LA55 family of dual-port SRAMs. This series is designed for standalone 8-bit operation or as a master unit in wider data bus systems. It shares functional similarities with other members like the 71321LA55JI8 but differs in package type and temperature rating specifications. The SA suffix typically denotes commercial temperature range operation compared to the LA variant which supports industrial ranges.

Memory IC Replacement Considerations

Renesas recommends the 7007L20PFGI as a manufacturer-recommended substitute. Users should verify pinout compatibility and electrical parameter alignment before integration. No direct cross-manufacturer equivalents are confirmed in official documentation.