71V2556SA133BG

Memory IC Overview

The 71V2556SA133BGG is a 4.5 Mbit synchronous Single Data Rate (SDR) Zero Bus Turnaround (ZBT) static random-access memory (SRAM) manufactured by Renesas Electronics Corporation. Organized as 128K x 36, this component operates with a maximum clock frequency of 133 MHz and features an access time of 4.2 ns. It utilizes a 3.3V power supply within the range of 3.135V to 3.465V and supports 2.5V I/O levels. The device is housed in a 119-pin Plastic Ball Grid Array (PBGA) package measuring 14x22 mm. Designed for fully pipelined applications, it ensures efficient data throughput without dead cycles between read and write operations.

Memory IC Feature Summary

• Zero Bus Turnaround (ZBT) technology eliminates dead bus cycles during bus turnaround between reads and writes or vice versa.
• Fully pipelined architecture with internally synchronized output buffer enable registers for address, data, and control signals.
• Supports four-word burst capability in either interleaved or linear modes for high-speed sequential data access.
• Features individual byte write control pins allowing selective data masking across the 36-bit data width.

Memory IC Applications

• High-performance processor secondary cache systems
• Network routing and switching equipment requiring low-latency buffering
• Telecommunications infrastructure base stations
• Industrial automation controllers demanding fast parallel memory access

Memory IC Procurement Notes

Verify the specific suffix 'BGG' against official Renesas documentation to confirm the exact package dimensions and pinout configuration. Confirm that the 133 MHz speed grade matches system timing requirements. Check current product status as discontinuation notices may affect long-term availability. Ensure voltage compatibility between the 3.3V core and 2.5V I/O supplies in the target design.

Memory IC Selection Notes

Select this component when zero bus turnaround latency is critical for system performance compared to standard synchronous SRAMs. Consider the 128K x 36 organization if wide data paths are required without multiple chip selections. Evaluate the 119-PBGA package constraints for PCB layout density. Compare against other ZBT variants based on clock frequency and I/O voltage requirements to ensure optimal power and speed balance.

Memory IC Part Context

The 71V2556 belongs to the Renesas 71V2556 family of ZBT Synchronous SRAMs. This family includes various speed grades and package options, such as the SA100 and SA166 series. These devices share the same fundamental ZBT architecture and organizational structure but differ in maximum operating frequencies and physical packaging. The family is designed to provide high-bandwidth memory solutions for embedded systems and networking applications.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing designs before considering alternative manufacturers or speed grades within the same family.