71321SA20PF

Memory IC Overview

The 71321SA20PF is a high-speed 2K x 8 Dual-Port Static RAM featuring internal interrupt logic for interprocessor communications. It operates with a single 5V ±10% power supply and supports fully asynchronous access from either port. The device includes automatic power-down features controlled by chip enable signals, allowing on-chip circuitry to enter low standby modes. It utilizes true dual-ported memory cells enabling simultaneous access to the same location. The component provides two INT flags for port-to-port communication and includes on-chip port arbitration logic with BUSY output flags.

Memory IC Feature Summary

• True dual-ported memory architecture allows simultaneous independent access to shared memory locations without conflict.
• Integrated interrupt logic facilitates direct interprocessor communication through dedicated INT flags.
• On-chip port arbitration logic manages bus conflicts and provides BUSY status outputs.
• Automatic power-down mode reduces standby current when chip enable signals are inactive.

Memory IC Applications

• Interprocessor communication in multi-core or multi-microcontroller systems
• Master Dual-Port RAM configuration in 16-bit or wider data bus systems
• Stand-alone 8-bit Dual-Port RAM applications requiring fast asynchronous access

Memory IC Procurement Notes

Verify RoHS compliance status as this specific package variant may not meet current environmental directives. Confirm lead times due to potential discontinuation or limited production runs. Check for moisture sensitivity level requirements during storage and handling. Validate pin compatibility if replacing older PLCC variants with different packaging options.

Memory IC Selection Notes

Select this part when synchronous dual-port SRAM is not required and asynchronous operation suffices. Ensure system voltage aligns with the 4.5V to 5.5V operating range. Consider temperature specifications if industrial grade (-40°C to +85°C) is needed, as commercial grades differ. Verify that the 52-pin PLCC package fits the target PCB layout constraints.

Memory IC Part Context

This component belongs to the Renesas 71321 series of dual-port static random-access memories. The series offers various access speeds and package options including PLCC and TQFP configurations. It is designed for applications requiring high-speed data sharing between processors without external arbitration logic.

Memory IC Replacement Considerations

71321LA20PFG is listed as an upgrade alternative. Verify package differences and RoHS compliance before substitution. Other speed variants like 71321SA25JI exist but require timing adjustment validation.