What this synchronous SRAM does on the bus
The Cypress (now Infineon) CY7C1383D-133AXIT is an 18 Mbit synchronous SDR (single data rate) SRAM organized as 1M x 18 bits.
6.5 ns access time and 133 MHz clock — what they mean for timing closure
At 133 MHz (7.5 ns cycle), that leaves about 1 ns of setup margin before the next clock edge — tight, but workable with controlled impedance traces under 50 mm. The SDR interface latches data on each rising edge, so the bus turnaround penalty is one dead cycle between read and write. For back-to-back read throughput, the pipeline delivers one word per clock after the initial latency.
No official successor part number appears in the record. The 100-TQFP footprint is shared across the CY7C1383D density range, so a drop-in replacement within the family may exist — verify pin compatibility against the datasheet before committing a board spin.
Package and mounting notes for the 100-TQFP
The package is MSL 3, so if the moisture barrier bag has been open longer than the floor-life window, a bake at 125°C for 24 hours is required before reflow. Tape & Reel (TR) packaging feeds directly into automated pick-and-place lines.