71421LA25PFI8

Overview

The 71421LA25PFI8 is a 16Kb (2K x 8) dual-port static RAM manufactured by Renesas Electronics Corporation. It features asynchronous parallel interface with 25 ns access time and operates on a single 5V supply within the 4.5V to 5.5V range. The device supports simultaneous independent access to memory locations from two ports, including internal interrupt logic for interprocessor communication. It is housed in a 64-pin TQFP package with dimensions of 10x10 mm and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• True dual-ported memory architecture enabling simultaneous read/write access to identical addresses from both ports without conflict.
• Integrated internal interrupt logic providing dedicated flags for efficient port-to-port processor communication.
• Automatic power-down mode controlled by chip enable signals to minimize standby power consumption.
• On-chip arbitration logic manages bus conflicts during simultaneous access scenarios.

Applications

• Interprocessor communication buffers in multi-CPU systems
• High-speed data buffering between microcontrollers and peripherals
• Real-time control applications requiring low-latency shared memory

Procurement Notes

Verify component authenticity through authorized channels as this part may be obsolete or end-of-life. Confirm RoHS compliance status and lead-free requirements against current project specifications. Check for valid replacement parts such as the 71321LA series if availability is constrained. Ensure packaging type matches assembly line capabilities.

Selection Notes

Select this component when true dual-port functionality with integrated interrupts is required for 8-bit data buses. Consider the 25 ns speed grade for moderate performance needs. Evaluate package compatibility with existing PCB footprints. Verify voltage tolerance aligns with system power rails.

Part Context

This device belongs to the 71421/71321 family of dual-port SRAMs designed for high-performance embedded systems. The 'LA' suffix indicates industrial temperature range operation, while 'PFI8' denotes the specific tape-and-reel packaging configuration. It serves as a master or standalone unit in expanded width configurations.

Replacement Considerations

Publicly confirmed substitute: 71321LA25PFGI8. Verify pinout and electrical parameter equivalence before integration.