71V3559S85PF

Overview

The IDT71V3559S85PF is a synchronous SDRAM Zero Bus Turnaround (ZBT) SRAM IC manufactured by Renesas Electronics Corporation. It features a storage capacity of 4.5Mb organized as 256K x 18 bits with a parallel interface. The device supports an access time of 8.5 ns and operates within a supply voltage range of 3.135V to 3.465V. It is housed in a 100-TQFP package measuring 14x14 mm and is rated for an operating temperature range of -40°C to 85°C.

Feature Summary

• Supports high-performance system speeds through zero bus turnaround technology, eliminating dead cycles between write and read operations.
• Features internally synchronized output buffer enable to simplify control requirements without external OE management.
• Utilizes a single R/W control pin to manage both read and write functions, reducing interface complexity.

Applications

• High-speed data buffering in telecommunications equipment
• Cache memory implementation in network routers and switches
• Data acquisition systems requiring fast random access

Procurement Notes

Verify the specific suffix 'PF' against official Renesas documentation to confirm the exact package type and lead-free status. Check Product Change Notices for discontinuation dates or assembly site changes, as this component family has undergone manufacturing transitions. Ensure compatibility with existing board layouts regarding the 100-TQFP footprint and thermal requirements.

Selection Notes

Select this component when a 256K x 18 configuration is required for ZBT SRAM applications. Compare against other suffixes such as 'PFGI' or 'BQ' if different packaging options like BGA or RoHS-compliant versions are needed. Verify that the 8.5 ns speed grade meets the system timing constraints and that the industrial temperature range aligns with the operational environment.

Part Context

This part belongs to the IDT 71V3559 series of 3.3V synchronous ZBT SRAMs. The series includes variants with different access times and package types, such as the 71V3557 for 36-bit width configurations. The manufacturer transitioned from Integrated Device Technology to Renesas Electronics, affecting branding but maintaining technical continuity for these legacy components.

Replacement Considerations

Publicly confirmed substitute part numbers include IS61LF25618A-7.5TQLI and IS61LF25618EC-7.5TQLI from ISSI. These alternatives offer similar memory organization and performance characteristics for direct replacement in compatible designs.