What this 128K x 36 synchronous SRAM delivers
The CY7C1347F-100AC is a 4.5 Mbit synchronous SRAM from Infineon, organized as 128K words of 36 bits each — the extra 4 bits per word suit systems that need parity or ECC without external logic. It clocks at 100 MHz with a 4.5 ns access time, meaning the first word appears on the bus 4.5 ns after the address is latched; subsequent pipelined reads run at the full 100 MHz rate. If the board lives in an enclosure with no active cooling or sees outdoor air, this part is not the right fit; look for an industrial-temperature variant in the same family.
Infineon lists the CY7C1347F-100AC as Active. Sourced through Infineon's authorized distribution network.
Package and layout checklist
The 100-TQFP (14x20 mm) has a 0.5 mm pitch — a 4-layer PCB is recommended for signal integrity at 100 MHz. The datasheet shows the recommended land pattern; keep the supply decoupling capacitors within 5 mm of each VDD/VDDQ pin pair. Supply pins are split between VDD (core, 3.3 V) and VDDQ (output buffer, 3.3 V). On the datasheet, both are tied to the same 3.15 V–3.6 V rail, but each pin group should have its own local 0.1 µF ceramic cap to keep switching noise off the core supply.