256K x 36 synchronous SRAM — what the 100 MHz clock and 7.5 ns access mean on the bus
The CY7C1355C-100AXC is a 9 Mbit synchronous SRAM organized as 256K words by 36 bits. It clocks at 100 MHz and delivers a 7.5 ns access time from clock edge to data valid — this sets the bus turnaround window for the memory controller. The 36-bit wide word matches a 32-bit data bus with parity or ECC bits, or a 36-bit DSP data path, without needing two chips.
NoBL™ pipeline — dead-cycle elimination on a shared bus
This part belongs to the NoBL™ (No Bus Latency) family. The pipeline architecture lets the controller issue a new read or write address on every clock cycle without inserting dead cycles between reads and writes. On a shared memory bus where the master alternates read and write transactions, NoBL™ keeps the data rate at the full 100 MHz instead of dropping to half-rate during direction changes.
100-TQFP footprint — rework and board integration
Housed in a 100-lead TQFP with a 14x20 mm body (supplier device package 100-TQFP). The 0.5 mm pitch fine-pitch QFP is hand-reworkable with hot air and flux — the leads are exposed, so alignment and solder inspection are straightforward compared to a BGA. Pin 1 is chamfered on the package corner; the orientation mark is unambiguous under a microscope.
Infineon lists this part as Obsolete. The 100-TQFP package and 3.3 V synchronous interface are common enough that a functional replacement exists in the same density/speed grade, but a pin-compatible drop-in is not guaranteed without a cross-reference check against the BOM's timing and loading.