71V2556S166PFGI8

Overview

The 71V2556S166PFGI8 is a 4.5 Mbit synchronous SRAM organized as 128K x 36, manufactured by Renesas Electronics Corporation. It operates with a 3.3V core supply and 2.5V I/O voltage, supporting a maximum clock frequency of 166 MHz with a 3.5 ns access time. The device utilizes Zero Bus Turnaround (ZBT) technology to eliminate dead cycles during bus turnaround. It is housed in a 100-pin TQFP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Zero Bus Turnaround (ZBT) architecture eliminates dead cycles between read and write operations
• Fully pipelined design with internal synchronization for address, data, and control signals
• Supports four-word burst capability in either interleaved or linear modes
• Includes individual byte write control pins for precise data masking

Applications

• High-speed networking equipment requiring low-latency memory buffering
• Telecommunications systems utilizing ZBT interface standards
• Industrial automation controllers needing fast parallel data access

Procurement Notes

Verify component authenticity through authorized distributors due to discontinuation status. Confirm RoHS compliance variations across production batches, as some units may not meet current environmental regulations. Check moisture sensitivity level handling requirements before assembly to prevent package damage during soldering processes.

Selection Notes

Select this model when a 36-bit wide synchronous interface is required alongside 3.3V core logic. Ensure the system design accommodates the specific 2.5V I/O voltage level distinct from the core supply. Consider the 100-pin TQFP footprint constraints against available PCB real estate compared to BGA alternatives in the same series.

Part Context

This part belongs to the 71V2556 family of ZBT synchronous SRAMs, offering varying speed grades and package options. It shares architectural similarities with other members like the 71V2556SA166BGI but differs in pinout and physical dimensions. The series is designed for applications demanding high throughput without the complexity of asynchronous timing.

Replacement Considerations

Direct substitutes include the 71V2556S133PFGI for lower speed requirements. Verify pin compatibility and voltage levels when considering cross-package replacements such as BGA variants.