71421LA25PFI

Overview

The Renesas Electronics Corporation 71421LA25PFI is a high-speed, 16Kbit (2K x 8) Dual-Port Static RAM IC. It features asynchronous parallel interface with a maximum access time of 25 ns. The device operates on a single 5V power supply within the 4.5V to 5.5V range and supports surface mount installation in a 64-TQFP package measuring 14x14 mm. It includes internal interrupt logic for interprocessor communications and offers an automatic power-down feature controlled by chip enable signals.

Feature Summary

• Dual-port architecture enabling simultaneous independent access by two processors
• Internal interrupt logic designed specifically for efficient interprocessor communication
• Automatic power-down mode reduces standby power consumption when not actively accessed

Applications

• Interprocessor communication systems requiring shared memory access
• Master/Slave dual-port configurations in 16-bit or wider data bus systems
• High-speed standalone 8-bit dual-port RAM applications

Procurement Notes

Verify component authenticity through authorized channels as this part is obsolete. Confirm package integrity and moisture sensitivity handling procedures prior to assembly. Check for RoHS compliance status as older revisions may not meet current environmental standards. Ensure design-in compatibility with existing system voltage levels and timing requirements before procurement.

Selection Notes

Select this component for designs requiring fast, independent dual-port memory access without external arbitration logic. Suitable for legacy systems maintaining 5V operation standards. Consider pinout compatibility if replacing earlier variants in the 71321/71421 family. Evaluate thermal performance within the specified commercial temperature range during PCB layout.

Part Context

Part of the Renesas 71321/71421 series of high-speed dual-port SRAMs. The 71421 variant typically serves as the slave port in multi-port configurations alongside the 71321 master port. This specific model integrates interrupt generation capabilities to facilitate seamless data exchange between processing units without additional discrete logic components.

Replacement Considerations

IDT71421LA25PFI is a confirmed equivalent part number from IDT/Renesas. Verify pin compatibility and electrical specifications match exactly when substituting. Other family members like 71421LA20PFI offer faster speeds but require compatible system timing.