71321SA55TF

Memory IC Overview

The 71321SA55TF 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 55 ns. The device operates on a single 5V ±10% power supply within the voltage range of 4.5V to 5.5V. It supports simultaneous independent access from two ports and includes internal interrupt logic for interprocessor communications. The component is housed in a 64-pin TQFP surface-mount package.

Memory IC Feature Summary

• True dual-ported memory cells enabling simultaneous access to the same memory location from both ports
• Integrated interrupt flags facilitating direct port-to-port communication without external logic
• Automatic power-down feature controlled by chip enable inputs for low standby power consumption
• On-chip arbitration logic with BUSY output flag to manage concurrent access conflicts

Memory IC Applications

• Interprocessor communication buffers in multi-CPU systems
• High-speed data buffering between microprocessors and peripherals
• Master/Slave dual-port RAM configurations expanding data bus width to 16 bits or more
• Real-time engine applications requiring fast, error-free data exchange

Memory IC Procurement Notes

Verify component authenticity through authorized distributors as this part may be obsolete. Confirm RoHS compliance status, as older variants often lack lead-free certification. Check datasheet revisions for pinout consistency if replacing existing designs. Ensure supply chain stability due to potential discontinuation status associated with the SA series suffix.

Memory IC Selection Notes

Select this component when true dual-port functionality with integrated interrupt logic is required for synchronous data sharing. Compare access times against system clock requirements to ensure 55 ns meets timing constraints. Consider the 64-TQFP package dimensions for PCB layout compatibility. Evaluate power consumption profiles if battery backup operation is necessary, noting that LA series variants offer specific retention features.

Memory IC Part Context

This component belongs to the 71321SA/LA family of high-speed dual-port SRAMs designed for stand-alone or master/slave configurations. The SA suffix typically denotes standard commercial or industrial temperature ranges depending on specific revision, while the LA variant offers battery backup capabilities. The family supports expansion to wider data buses using companion slave devices like the 71421.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 71321LA25TFGI8.