71321SA20PF8

Memory IC Overview

The Renesas Electronics Corporation 71321SA20PF8 is a high-speed, 16Kb (2K x 8) dual-port static random-access memory (SRAM). It features asynchronous parallel interface operation with a 20 ns access time. The device operates on a single 5V ±10% power supply and supports battery backup for data retention. It is housed in a 64-pin Thin Quad Flat Package (TQFP) and is designed for interprocessor communications.

Memory IC Feature Summary

• True dual-ported memory cells allow simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt logic provides two INT flags for efficient port-to-port communication between processors.
• On-chip port arbitration logic manages bus conflicts, enabling expansion to 16-bit or wider data buses when paired with compatible slave devices.

Memory IC Applications

• Interprocessor communication links in multi-core or distributed processing systems
• Master dual-port RAM configurations in 16-bit or wider word width systems
• High-speed buffer memory requiring simultaneous read/write access from separate controllers

Memory IC Procurement Notes

This component is officially discontinued and no longer manufactured by Renesas Electronics Corporation. Verification of current availability requires checking authorized distributors for remaining stock or obsolete inventory. Procurement should prioritize verified replacement parts to ensure long-term supply chain stability and compliance with current manufacturing standards.

Memory IC Selection Notes

Designers must account for the discontinuation status when selecting this part for new products. The primary consideration is identifying a suitable replacement within the same family that maintains pin compatibility and functional equivalence. Verify that the substitute supports the required 20 ns access time, 64-pin TQFP package, and 5V operating voltage specifications.

Memory IC Part Context

The 71321SA series belongs to Renesas' high-speed dual-port SRAM family, designed for applications requiring fast, conflict-free data sharing between two independent masters. This specific model represents an earlier generation SA variant, distinct from the LA series which offers additional battery backup capabilities. It serves as a master device in hierarchical memory architectures.

Memory IC Replacement Considerations

The 71321LA20PFG8 is documented as an upgrade replacement for the 71321SA20PF8. Both share identical pinouts and core functionality, though the LA variant includes battery backup support. Ensure the system design accommodates any differences in RoHS compliance or environmental ratings between the obsolete SA part and the active LA substitute.