The CY7C09179V-12AC is a Cypress 288Kbit synchronous dual-port SRAM organized as 32K x 9 bits — the ninth bit is often used for parity or a tag flag alongside each byte. The 12 ns access time is the window both ports have to arbitrate and read or write without colliding. At a 50 MHz clock, that 12 ns window sets the bus-turnaround margin for a shared-memory design where two processors or controllers exchange data through the same array.
Why the 9-bit width matters for cross-shopping
The 32K x 9 organization (288Kbit total) means this part carries an extra data bit per address — typically a parity or a semaphore bit.
Cypress lists the CY7C09179V-12AC as Obsolete.
Package and temperature — the fit constraints
The 100-pin LQFP (also specified as 100-TQFP, 14x14 mm body) is the footprint. That rules out outdoor, under-hood, or unheated industrial enclosures. Supply voltage is 3V to 3.6V, so a 3.3V rail with ±5% tolerance keeps it inside the window.