71321SA20TF

Memory IC Overview

The Renesas Electronics Corporation 71321SA20TF is a high-speed, 16Kbit (2K x 8) dual-port static random-access memory (SRAM) device. It features asynchronous parallel interface operation with a maximum access time of 20 ns and write cycle time of 20 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) measuring 10x10 mm, designed for surface mount installation. The device supports an industrial operating temperature range of 0°C to 70°C.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt logic providing two INT flags for efficient port-to-port communication and interprocessor signaling.
• On-chip port arbitration logic with BUSY output flag to manage data bus contention during simultaneous accesses.
• Automatic power-down feature controlled by chip enable signals to reduce standby power consumption.

Memory IC Applications

• Stand-alone 8-bit dual-port RAM systems requiring independent processor access.
• Master dual-port RAM configurations expanding data bus width to 16 bits or more when paired with Slave devices.
• Interprocessor communication interfaces utilizing internal interrupt flags for status signaling.

Memory IC Procurement Notes

Verify component authenticity and physical condition upon receipt, as this part is officially obsolete and no longer manufactured. Confirm that the received unit matches the original specifications, including the 64-TQFP package and 20 ns speed grade. Check for moisture sensitivity damage, given the MSL rating, before soldering. Ensure compatibility with existing system voltage requirements of 4.5V to 5.5V.

Memory IC Selection Notes

Select this component only if legacy support for the 71321SA series is required for specific master-slave expansion architectures. Verify that the 20 ns access time meets the system timing constraints. Consider the 64-TQFP footprint for PCB layout compatibility. Note that RoHS compliance may vary depending on the manufacturing date, as older versions were non-compliant.

Memory IC Part Context

The 71321SA20TF belongs to the Renesas 71321SA/LA family of high-speed dual-port SRAMs. This family is characterized by its ability to function as a Master device in multi-port systems, coordinating with Slave counterparts like the 71421. The 'SA' suffix typically denotes standard industrial temperature ranges and specific packaging options within the broader product line.

Memory IC Replacement Considerations

The 71321LA20TFG is listed as an upgrade replacement. Verify pinout and electrical compatibility before substitution. Other obsolete variants such as 71321SA20J8 or 71321SA35TFG offer different packages or speeds but are also end-of-life.