18 Mbit synchronous SRAM in a 100-TQFP — the NoBL bus story
The CY7C1372KV25-167AXCT: The NoBL (No Bus Latency) architecture means back-to-back reads from the same bank do not insert dead cycles — the pipelined output register holds the previous word while the next address is latched, so the controller sees a continuous data stream at the full clock rate. That matters for a cache line fill or a real-time trace buffer where every cycle of bus idle eats into the timing margin. The supply tolerance is tight — 2.375 V to 2.625 V — so the rail needs a clean LDO or a low-ripple DC-DC within 125 mV of 2.5 V. The commercial temperature grade (0 °C to 70 °C) limits it to indoor, non-condensing environments; an industrial or automotive design would need a different temperature bin.
That means it is still a valid choice for a new design-in, and the supply channel supports volume commitments without a looming obsolescence risk.
Package and board-fit — 100-TQFP 14x20 mm
The 100-TQFP (14x20 mm) has a 0.5 mm pitch — a four-layer PCB is the practical minimum for fan-out, with the inner planes handling the 2.5 V core supply and ground return. The synchronous parallel interface (address, data, control) runs at 167 MHz — trace-length matching on the data bus within 50 mm keeps skew under 0.5 ns.