71321SA17TFI8

Memory IC Overview

The 71321SA17TFI8 is a high-speed 16Kb (2K x 8) dual-port static RAM manufactured by Renesas Electronics Corporation. It features asynchronous parallel interface with a maximum access time of 17 ns. The device operates on a single 5V ±10% power supply, ranging from 4.5V to 5.5V. It is housed in a 64-pin TQFP package with dimensions of 10x10 mm and supports an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• True dual-ported memory cells enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt logic providing two INT flags for efficient interprocessor communication and status signaling.
• On-chip port arbitration logic manages bus conflicts automatically, allowing expansion to 16-bit or wider systems when paired with a slave device.

Memory IC Applications

• Interprocessor communications requiring low-latency data exchange between multiple microprocessors.
• Master dual-port RAM configurations expanding data bus width when used in conjunction with 71421 slave devices.
• Battery-backed memory systems utilizing automatic power-down features controlled by chip enable signals.

Memory IC Procurement Notes

Verify component authenticity through authorized distributors due to obsolete status. Confirm RoHS compliance requirements as this specific variant may not meet current environmental standards. Validate package integrity and pin alignment against datasheet specifications before integration into final assembly processes.

Memory IC Selection Notes

Select this component for applications requiring true simultaneous dual-port access with integrated arbitration. Ensure system voltage aligns with the 4.5V to 5.5V operating range. Consider thermal management for the -40°C to +85°C industrial grade environment. Evaluate compatibility with existing TTL-compatible logic levels for seamless interface integration.

Memory IC Part Context

This part belongs to the 71321/71421 family of dual-port SRAMs designed for high-speed multiprocessing. The 71321 series serves as the master unit, while the 71421 acts as the slave to extend word width. These components eliminate the need for external discrete logic in wide-data bus architectures, simplifying board design and reducing component count.

Memory IC Replacement Considerations

Public confirmed substitute: 71321LA25PFGI. This upgrade offers similar functionality with potentially different speed grades and lead-free packaging options. Verify electrical compatibility and pinout correspondence before implementation.

Memory IC FAQ

How does the 71321SA17TFI8 handle simultaneous access to the same memory address?

It utilizes true dual-ported memory cells that allow both ports to access the same location simultaneously. On-chip arbitration logic resolves any bus conflicts automatically without requiring external control circuitry.

What is the purpose of the internal interrupt logic in this SRAM?

The internal interrupt logic provides two INT flags that facilitate direct interprocessor communication. These flags signal status changes or data availability between connected processors without polling overhead.