71V321L25TF

Overview

The Renesas Electronics Corporation 71V321L25TF is a dual-port static random-access memory (SRAM) device organized as 2K words by 8 bits, providing a total storage capacity of 16 kilobits. It operates on a single 3.3V power supply with a voltage range of 3.0V to 3.6V. The component features asynchronous parallel interfaces for both ports, supporting independent read and write operations. The access time is specified at 25 nanoseconds. It is housed in a 64-pin Thin Quad Flat Package (TQFP) with a 10mm x 10mm footprint. The device supports battery backup operation with data retention down to 2V.

Feature Summary

• True dual-ported architecture allowing simultaneous independent access to the same memory location from either port.
• On-chip port arbitration logic manages conflicts when both ports attempt to access the same address simultaneously.
• Interrupt flags facilitate communication between the two ports for status signaling.
• Fully asynchronous operation enables flexible timing control for both read and write cycles.

Applications

• High-speed data buffering in telecommunications equipment
• Network switch and router packet buffering systems
• Industrial automation controllers requiring fast data logging
• Embedded systems needing isolated dual-port memory for processor-to-peripheral communication

Procurement Notes

Verify the specific suffix requirements carefully, as package dimensions and moisture sensitivity levels vary significantly across variants. Confirm RoHS compliance status, as older revisions may not meet current environmental standards. Check for obsolescence notices, as this part number may be discontinued or superseded by newer generations within the 71V321L family. Ensure the selected variant matches the required operating temperature range for your specific application environment.

Selection Notes

Select this component when true simultaneous access to shared memory is critical for system performance. Compare against single-port alternatives if only one master accesses the memory. Consider the 25ns speed grade versus slower options based on clock frequency requirements. Verify that the 64-TQFP package fits the available PCB real estate and thermal constraints. Evaluate the need for interrupt flags and arbitration logic to simplify firmware design compared to external arbitration solutions.

Part Context

The 71V321L belongs to Renesas' high-speed dual-port SRAM family, derived from legacy IDT designs. This series is widely used in applications requiring low-latency data sharing between two independent processors or buses. The L-series typically denotes 3.3V operation with specific power-down characteristics. The TQFP-64 package provides a compact solution for dense board layouts while maintaining reliable surface-mount assembly.

Replacement Considerations

Direct replacements include the 71V321L25TFG and 71V321L25PFGI. Verify pin compatibility and electrical specifications before substitution. Note that suffix changes may indicate differences in packaging, lead finish, or environmental compliance rather than functional changes.