71321SA35TFG

Memory IC Overview

The Renesas Electronics Corporation 71321SA35TFG is a high-speed, 16Kb (2K x 8) dual-port static random-access memory (SRAM) device. It features asynchronous parallel interface operation with a maximum access time of 35 ns. The component operates on a single 5V ±10% power supply, supporting voltage levels between 4.5V and 5.5V. It is housed in a 64-pin Thin Quad Flat Package (TQFP) suitable for surface-mount technology. The device includes internal interrupt logic for interprocessor communications and supports battery backup data retention.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from two separate ports.
• Integrated internal interrupt flags facilitate direct port-to-port communication without requiring external discrete logic components.
• On-chip port arbitration logic manages bus conflicts automatically, ensuring error-free full-speed operation when cascaded with slave devices.
• Automatic power-down feature controlled by chip enable signals allows circuitry to enter low standby power modes.

Memory IC Applications

• Interprocessor communication links in multi-core or distributed processing systems
• Master dual-port RAM configurations expanding data bus width to 16 bits or more using slave SRAMs
• Battery-backed volatile memory storage requiring fast asynchronous read/write cycles

Memory IC Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence notices. Confirm package markings match official datasheet specifications to avoid counterfeit risks. Check RoHS compliance status against specific manufacturing dates, as legacy stock may vary. Ensure environmental operating temperature ranges align with system requirements before finalizing procurement orders.

Memory IC Selection Notes

Select this component when simultaneous bidirectional data access is required between two processors. Verify that the 35 ns access speed meets system timing constraints. Ensure the design accommodates the 64-TQFP footprint and 5V logic levels. Consider the integrated interrupt logic benefits over standard dual-port alternatives to reduce external component count.

Memory IC Part Context

This device belongs to the 71321 series of dual-port SRAMs manufactured by Renesas Electronics. It is designed specifically for applications requiring high-speed data sharing between microprocessors. The series supports various access times and packaging options, with this specific model focusing on the 35 ns speed grade in a TQFP enclosure.

Memory IC Replacement Considerations

• 71321LA20TFG

Memory IC FAQ

Can the 71321SA35TFG operate in 16-bit wide systems?

Yes, it can function as a master dual-port RAM to expand data bus width to 16 bits or more when used together with a slave dual-port RAM device like the 71421.

What is the purpose of the BUSY output flag?

The BUSY output flag indicates when the on-chip port arbitration logic is resolving a conflict, preventing data corruption during simultaneous access attempts.