71321SA35PF

Memory IC Overview

The Renesas Electronics Corporation 71321SA35PF is a high-speed 16Kbit (2K x 8) dual-port static RAM featuring internal interrupt logic for interprocessor communications. It operates with a single 5V ±10% power supply and provides 35 ns access time. The device supports fully asynchronous operation from either port and includes on-chip arbitration logic with BUSY output flags. It is designed to function as a standalone 8-bit dual-port RAM or as a master unit paired with the 71421 slave in wider data bus systems. The component utilizes true dual-ported memory cells allowing simultaneous access to the same location.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to identical memory locations by both ports without conflict.
• Integrated interrupt logic providing two INT flags for direct interprocessor communication and status signaling between connected devices.
• On-chip port arbitration mechanism utilizing BUSY output flags to manage concurrent access requests efficiently.
• Automatic power-down capability controlled by chip enable signals, allowing circuitry to enter low standby power modes.

Memory IC Applications

• Interprocessor communication interfaces requiring fast data exchange between microprocessors.
• Master dual-port RAM units in 16-bit or wider parallel data bus systems when paired with compatible slave devices.
• Standalone 8-bit dual-port memory buffers in embedded control architectures.
• Battery-backed memory applications requiring data retention during main power loss.

Memory IC Procurement Notes

Verify package type and suffix codes carefully, as variations exist across TQFP and PLCC formats. Confirm RoHS compliance status, as older manufacturing runs may differ from current specifications. Check for end-of-life notices or obsolescence warnings before finalizing design-in decisions. Ensure voltage supply requirements match the specific operational range of the target system environment.

Memory IC Selection Notes

Select this component for designs requiring true simultaneous dual-port access without external arbitration logic. Suitable for systems needing integrated interrupt signaling for processor synchronization. Consider the 71421 companion device if expanding data width beyond 8 bits. Verify temperature range requirements against available industrial or commercial variants within the product family.

Memory IC Part Context

This part belongs to the 71321/71421 series of dual-port SRAMs manufactured by Renesas Electronics. The series is characterized by high-speed asynchronous operation and integrated communication features. It serves as a foundational memory solution for complex multi-processor systems requiring reliable data sharing and synchronization capabilities.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers include 71321LA20PFG and 71321LA25PFGI. These alternatives offer different access speeds but maintain similar functional characteristics within the same product family.

Memory IC FAQ

Can the 71321SA35PF operate as a standalone memory unit?

Yes, it is designed to function as a stand-alone 8-bit dual-port RAM without requiring additional discrete logic components.

What is the purpose of the internal interrupt logic?

The internal interrupt logic provides two INT flags specifically for facilitating interprocessor communications and status signaling between connected devices.

How does the device handle simultaneous access to the same memory location?

It uses true dual-ported memory cells that allow simultaneous access to the same location, managed by on-chip port arbitration logic and BUSY output flags.