71V3577YS85PF

Overview

The 71V3577YS85PF is a synchronous SDR SRAM IC manufactured by IDT. It provides a total memory capacity of 4.5 Mbit, organized as 128K words by 36 bits. The device features an access time of 8.5 ns and operates at a supply voltage of 3.3V. It utilizes a parallel interface and is housed in a 100-pin TQFP package measuring 14x20 mm.

Feature Summary

• Synchronous Single Data Rate (SDR) architecture for high-speed data transfer
• Flow-through output mode for continuous data availability
• Integrated burst counter for sequential access operations

Applications

• High-performance computing systems requiring fast volatile memory
• Network infrastructure equipment
• Industrial control systems

Procurement Notes

Verify the specific suffix 'Y' indicates the industrial temperature rating and 'S' denotes the synchronous type when sourcing replacements. Confirm the package marking matches the 100-TQFP specification to ensure compatibility with existing PCB footprints and thermal requirements.

Selection Notes

Select this component when a 36-bit wide data path is required for system bus alignment. The synchronous interface simplifies timing design compared to asynchronous alternatives. Ensure the host controller supports the specific clocking and burst protocols defined for this 4.5Mbit density class.

Part Context

This part belongs to the IDT 71V3577 family of synchronous SRAMs. It shares architectural similarities with other members but differs in speed grade and organization. The 128Kx36 configuration targets applications needing wider data buses than standard 8-bit or 16-bit memories provide.

Replacement Considerations

Direct substitutes include IDT71V3577S85PFI for industrial temperature range variants. Verify that any replacement maintains the 100-TQFP footprint and 3.3V operating voltage to ensure pin-to-pin compatibility without circuit modification.