71321LA35TFI8

Memory IC Overview

The 71321LA35TFI8 is a high-speed, 16-kbit (2K x 8) dual-port static random-access memory manufactured by Renesas Electronics. It operates asynchronously with a maximum access time of 35 ns and supports parallel interface communication. The device functions within a supply voltage range of 4.5 V to 5.5 V and is designed for industrial temperature environments ranging from -40°C to +85°C. Packaged in a 64-pin Thin Quad Flat Package (TQFP), it features internal interrupt logic for interprocessor communications and includes automatic power-down capabilities controlled by chip enable signals to minimize standby power consumption.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt logic providing two dedicated flags for efficient port-to-port communication and synchronization.
• Automatic power-down mode activated by chip enable inputs, allowing on-chip circuitry to enter low standby power states.
• On-chip arbitration logic with BUSY output flags to manage data bus expansion and ensure error-free operation in master-slave configurations.

Memory IC Applications

• Interprocessor communication links in distributed computing systems requiring real-time data exchange.
• Master-slave dual-port RAM configurations for expanding data bus widths to 16 bits or more without discrete logic.
• Industrial control systems operating within extended temperature ranges requiring reliable asynchronous memory storage.
• Battery-backed memory applications utilizing the LA series' 2V data retention capability for non-volatile-like behavior during power loss.

Memory IC Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential counterfeit risks. Confirm RoHS compliance status as historical batches may vary; check specific datasheet revisions for lead-free certification details. Ensure proper handling procedures are followed given moisture sensitivity classification, which requires dry packing and baking before reflow soldering to prevent package damage during assembly processes.

Memory IC Selection Notes

Select this component when designing systems requiring true dual-port access with integrated interrupt signaling for processor synchronization. The LA variant specifically supports battery backup operations with data retention at lower voltages, making it suitable for critical data preservation scenarios. Ensure the design accommodates the 4.5V to 5.5V supply requirement and 64-pin TQFP footprint. Consider the 35 ns access speed against system timing constraints and verify thermal management for the -40°C to +85°C industrial grade specification.

Memory IC Part Context

This part belongs to the 71321LA family of dual-port SRAMs, distinguished by its low-voltage battery backup feature compared to the standard SA series. It shares architectural similarities with the 71421 slave counterpart but serves as the primary controller in multi-port expansions. The 'I' suffix typically denotes industrial temperature grading, while 'TFI8' indicates the specific tape-and-reel packaging format for automated surface-mount assembly.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers include 71321LA20TFGI8. Verify pinout compatibility and electrical specifications before substitution, as variations in access time or package dimensions may exist between legacy and updated revisions.