IDT7164S85DB

The IDT7164S85DB is a 64K-bit (8K × 8) CMOS static random-access memory (SRAM) manufactured by Renesas Electronics, belonging to the IDT7164S family of high-speed asynchronous SRAMs originally developed by Integrated Device Technology. The “-85” speed grade designates an access time of 85 nanoseconds, enabling fast data retrieval for legacy microprocessor and microcontroller interfaces. This device operates from a single 5-volt supply and features fully static circuitry, eliminating the need for external refresh while providing low standby power consumption. It is housed in a ceramic dual in-line package (CDIP), which delivers hermetic sealing and robust thermal performance suitable for extended temperature ranges and mechanically demanding environments.

Typical applications include embedded control systems in military and avionics platforms, where the SRAM’s fast cycle time and non-volatile-like data retention at reduced voltages (with battery backup) support secure program execution and critical parameter storage. It also fits into high-reliability industrial automation, down-hole instrumentation, and legacy telecommunications infrastructure that require component longevity and consistent timing margins. From a procurement standpoint, the CDIP package conforms to the requirements of high-reliability and military-grade designs, though this specific variant does not carry a full MIL-STD-883 screening prefix. As the 7164S family is a mature product, end-of-life risk and supply discontinuities are significant considerations—sourcing through specialized distributors with rigorous counterfeit mitigation and traceability protocols is essential for maintaining system sustainment in long-lifecycle programs.