100 MHz synchronous ZBT SRAM for high-throughput data paths
The Renesas 71V3558S100PFGI is a 4.5 Mbit synchronous SRAM built on a Zero Bus Turnaround (ZBT) architecture, clocked at 100 MHz with a 5 ns access time. It is organized as 256K words of 18 bits each, accessed through a parallel interface. This part targets applications where the memory bus must sustain back-to-back reads and writes without dead cycles — think network packet buffers, DSP scratchpads, and high-speed cache in telecom line cards or industrial controllers.
5 ns access time and 100 MHz clock — what they mean for bus timing
The 5 ns access time is the time from address assertion to valid data on the outputs. At a 100 MHz clock (10 ns period), that leaves roughly 5 ns of setup margin for the controller to latch the data — tight enough that signal-integrity on the address and data buses matters. The ZBT pipeline eliminates the turnaround cycle between read and write, so the controller can alternate transactions every clock edge without inserting idle cycles. If your FPGA or ASIC memory controller expects a pipelined synchronous SRAM with a 100 MHz ceiling, this part fits the timing budget.
The supply range of 3.135 V to 3.465 V (3.3 V nominal ±5%) aligns with standard 3.3 V logic rails. If your system runs a 3.3 V bus with a ±5% regulator, this SRAM stays within spec across the full temperature range without needing a separate supply.
The active status also means franchised distribution channels carry it, so supply is available through standard procurement routes.