71321LA55PFI

Memory IC Overview

The Renesas Electronics Corporation 71321LA55PFI is a high-speed, asynchronous dual-port static random-access memory (SRAM) device. It features a storage capacity of 16 kilobits organized as 2K words by 8 bits. The component supports parallel interface operation with an access time of 55 nanoseconds. It operates on a single 5V power supply within a voltage range of 4.5V to 5.5V. The device is housed in a 64-pin Thin Quad Flat Package (TQFP) measuring 14x14 mm. It includes internal interrupt logic for interprocessor communication and supports industrial operating temperatures from -40°C to +85°C.

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 functionality controlled by chip enable signals to minimize standby power consumption during idle periods.
• On-chip arbitration logic manages bus access conflicts, allowing expansion to 16-bit or wider data buses when paired with slave devices.

Memory IC Applications

• Interprocessor communication links between microprocessors requiring low-latency data exchange.
• Master dual-port RAM configurations in systems expanding data bus width using compatible slave SRAM devices.
• Real-time data buffering in industrial control systems operating within extended temperature ranges.
• Battery-backed memory applications utilizing the LA series capability for data retention at reduced voltages.

Memory IC Procurement Notes

Verify component authenticity through authorized distributors due to potential availability of refurbished units. Confirm package marking consistency with official datasheet specifications. Check for lead-free compliance status as RoHS conformity may vary by production batch. Validate pin compatibility if replacing legacy components in existing PCB layouts. Ensure proper handling procedures are followed due to moisture sensitivity classification.

Memory IC Selection Notes

Select this component when simultaneous bidirectional data access is required without external arbitration logic. Choose the LA variant over SA versions if battery backup operation below standard voltage levels is necessary. Consider the TQFP package dimensions for surface-mount assembly constraints. Verify that the 55ns access speed meets the timing requirements of the target system clock. Evaluate thermal management needs for industrial temperature range operations.

Memory IC Part Context

The 71321LA series belongs to Renesas' high-speed dual-port SRAM family designed for standalone or master-slave configurations. This specific model integrates interrupt logic to facilitate direct processor-to-processor messaging. The LA designation indicates enhanced voltage tolerance characteristics compared to standard variants. The device eliminates the need for discrete logic gates in multi-port memory expansions.

Memory IC Replacement Considerations

The 71321SA55PFI is a documented substitute part number offering similar electrical characteristics. Verify package dimension compatibility before substitution as minor variations may exist. Confirm that the replacement maintains the required interrupt logic functionality for system synchronization.