71V3557S85PFGI

Overview

The 71V3557S85PFGI is a synchronous single data rate zero-burst static random access memory manufactured by Renesas Electronics Corporation. It features a storage capacity of 4.5 Mbit organized as 128K x 36 bits. The device operates with a maximum access time of 8.5 ns and requires a supply voltage between 3.135 V and 3.465 V. It utilizes a parallel interface and is housed in a 100-TQFP (14x14) surface-mount package. The component supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Supports synchronous single data rate operation with zero-burst architecture for efficient data transfer.
• Features a 36-bit bus width suitable for high-performance system applications.
• Includes power-down control functionality managed by the ZZ input pin.

Applications

• High-speed digital signal processing systems
• Network infrastructure equipment requiring fast memory access
• Industrial control systems with strict timing requirements

Procurement Notes

This component has been officially declared obsolete and is no longer in production. Verification of availability should focus on existing stock from authorized distributors or secondary market suppliers. Ensure that any sourced units are genuine and match the original specifications, as replacement parts may require different electrical characteristics or pin configurations.

Selection Notes

Designers seeking this specific part must account for its end-of-life status when planning long-term production runs. Alternative components within the same family or newer generations should be evaluated for compatibility. Considerations include matching the 128K x 36 organization and ensuring the new device supports the required 3.3V core voltage and synchronous interface protocols.

Part Context

The 71V3557 series belongs to Renesas' portfolio of high-speed synchronous SRAMs designed for demanding embedded applications. These devices are engineered to provide low latency and high throughput, making them suitable for complex computing tasks. The specific S85 variant denotes the speed grade, while the PFGI suffix indicates the package type and temperature rating.

Replacement Considerations

Publicly confirmed substitute part numbers include 71V2556S133PFGI and 71V2556S150PFGI. These alternatives share similar organizational structures but may differ in clock frequency and I/O voltage levels. Engineers must verify electrical compatibility before implementation.

FAQ

What is the current manufacturing status of the 71V3557S85PFGI?

The component is obsolete and no longer in production according to official manufacturer notices.

Does the 71V3557S85PFGI support boundary scan testing?

Boundary scan JTAG interface is listed as an optional feature for the broader 71V3577 family, but specific inclusion in this exact part number requires datasheet verification.