What this NoBL SRAM brings to a high-speed bus
It clocks at 167 MHz with a 3.4 ns access time, meaning it can sustain back-to-back read or write transactions without dead cycles on the bus — a key advantage for packet buffers in networking gear or data caches in telecom line cards where every clock cycle matters. The parallel interface and 2.5 V supply (2.375 V to 2.625 V) match the I/O voltage of many ASICs and FPGAs from that era, so it drops into an existing 2.5 V memory bus without level shifters. It comes in a 100-TQFP (14x20 mm) package, surface-mount, and is rated for commercial temperature operation (0°C to 70°C).
Clock speed and access time — the throughput story
The NoBL architecture eliminates the turnaround cycle between read and write, so a controller can issue a read on one clock and a write on the next without inserting an idle cycle. For a system running a 166 MHz memory controller, that means sustained throughput close to the theoretical bus limit — no dead cycles eating into the bandwidth budget.
Cypress has placed the CY7C1370KV25-167AXC into Last Buy status. That means the manufacturer has announced end-of-life and is taking final orders before the part goes permanently out of production. If this SRAM is on your active BOM, you need to secure lifetime-buy quantities now or plan a migration to a successor. There is no official replacement listed in the available records, so the only channel going forward will be independent distribution — surplus and new-old-stock inventory sourced through brokers.
The 100-TQFP (14x20 mm) is a garden-variety fine-pitch QFP. Pin count is 100, pitch is 0.5 mm typical for this body size. No exposed pad, so rework with a hot-air station is straightforward — no BGA underfill or reball to worry about. If you are swapping this on a board in a repair bay, a standard QFP stencil and a hot-air pencil will do the job.