IDT71V2559S85PFG8

Memory IC Overview

The IDT71V2559S85PFG8 is a 4.5Mb synchronous SRAM organized as 256K x 18, manufactured by Renesas Electronics Corporation. It utilizes ZBT architecture to eliminate dead bus cycles during read/write transitions. The device operates with a 3.3V core supply and a 2.5V I/O supply, supporting clock frequencies up to 100 MHz with an 8.5 ns access time. It features flow-through outputs, a four-word burst capability, and individual byte write control. The component is packaged in a 100-pin plastic thin quad flatpack (TQFP) suitable for surface mount applications.

Memory IC Feature Summary

• ZBT architecture eliminates dead bus cycles between read and write operations
• Internally synchronized output buffers remove the need for external OE control
• Supports linear or interleaved four-word burst sequences via internal counter
• Provides individual byte write selection for precise data masking

Memory IC Applications

• High-performance system memory buffering
• Network router and switch packet storage
• Telecommunications equipment data caching
• Industrial control systems requiring fast turnaround

Memory IC Procurement Notes

Verify the specific suffix PFG8 corresponds to the 100-TQFP package and commercial temperature range. Confirm RoHS compliance status as historical documentation may vary. Ensure voltage levels match the required 3.3V core and 2.5V I/O specifications before integration into the design.

Memory IC Selection Notes

Select this component when zero bus turnaround latency is critical for system throughput. The 256K x 18 organization suits wide data path requirements. Verify that the host controller supports the synchronous interface timing and burst modes. Consider the dual-voltage requirement for power management strategies.

Memory IC Part Context

This part belongs to the IDT 71V2557/59 family of high-speed synchronous SRAMs. The '59' designation specifically indicates the 256K x 18 configuration, whereas the '57' variant offers a 128K x 36 organization. Both share identical pinouts and functional characteristics within the same package options.

Memory IC Replacement Considerations

IDT71V2559S85BG8 is a verified equivalent offering the same electrical specifications in a 119-ball grid array package.