ZBT synchronous SRAM for high-throughput data paths
The 71V3556S133PFGI is a 4.5 Mbit synchronous SRAM organized as 128K x 36 bits, using Zero Bus Turnaround (ZBT) architecture to eliminate dead cycles between read and write operations on a shared data bus. Rated for a 133 MHz clock with a 4.2 ns access time, this part sustains back-to-back transactions at full bus speed — the ZBT protocol means the bus never idles during direction changes, which matters for cache-tag or packet-buffer applications where every cycle counts.
Supply rails, temperature grade, and package fit
Operates from a 3.135 V to 3.465 V core supply — a standard 3.3 V rail with 5 % margin covers the full range. The industrial temperature grade (-40°C to +85°C) qualifies it for outdoor telecom, base-station line cards, and factory-floor controllers where ambient heat or cold-soak is a given. Housed in a 100-TQFP (14x14 mm) package with a 0.5 mm pitch. The footprint is common across the 71V3556 family, so a board layout validated for a slower speed grade accepts this 133 MHz variant without a respin — confirm the decoupling cap placement for the faster edge rates.