71321LA20JG8

Memory IC Overview

The Renesas Electronics Corporation 71321LA20JG8 is a high-speed 16Kbit (2K x 8) Dual-Port Static Random Access Memory. It features true dual-ported memory cells allowing simultaneous access to the same location, with an on-chip port arbitration logic and BUSY output flag. The device operates asynchronously from either port with a maximum access time of 20 ns. It supports a single 5V ±10% power supply, ranging from 4.5 V to 5.5 V, and includes two INT flags for interprocessor communications. The component is housed in a 52-pin PLCC package.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to shared memory locations by two processors.
• Integrated on-chip port arbitration logic with BUSY output flag to manage concurrent access conflicts automatically.
• Built-in interrupt logic providing two INT flags for efficient port-to-port communication without discrete logic.
• Asynchronous operation capability from either port, supporting battery backup data retention down to 2V.

Memory IC Applications

• Interprocessor communication in multi-core or multi-processor systems requiring low-latency data exchange.
• Master/Slave dual-port RAM configurations expanding data bus width to 16 bits or more when paired with compatible slave devices.
• Real-time data buffering in industrial control applications where simultaneous read/write operations are critical.

Memory IC Procurement Notes

Verify RoHS compliance status as the LA suffix typically indicates lead-free construction, but confirm against current manufacturer documentation. Check for moisture sensitivity level (MSL 3) handling requirements during storage and assembly. Ensure the 52-PLCC package footprint matches the target PCB design. Confirm availability as this specific part number may be subject to end-of-life notices or limited stock depending on the distributor.

Memory IC Selection Notes

Select this component when a 16Kbit capacity with 20 ns access time is required for asynchronous dual-port applications. It is suitable for designs needing integrated arbitration and interrupt flags to simplify system architecture. Consider the 52-PLCC package constraints if surface-mount technology is preferred over through-hole alternatives. Verify that the 5V TTL-compatible interface aligns with the host processor's voltage levels.

Memory IC Part Context

The 71321 series belongs to Renesas' high-speed CMOS Dual-Port SRAM family, designed for stand-alone or master/slave configurations. The 'LA' suffix denotes lead-free construction and extended temperature range options compared to older SA variants. This series replaces legacy IDT products, maintaining pin compatibility while offering improved power efficiency and modern manufacturing standards.

Memory IC Replacement Considerations

The 71321SA20JG8 is a non-RoHS compliant predecessor with identical electrical specifications. For lead-free requirements, ensure the LA variant is selected. Other members of the 71321 family, such as those with different access times (e.g., 25 ns), may serve as functional substitutes if timing margins allow.