The CY7C1382B-133AC: 18 Mbit synchronous SRAM organized as 512K words by 36 bits. Runs on a 133 MHz clock with a 4.2 ns access time, fed from a 3.135 V to 3.6 V supply.
4.2 ns access time at 133 MHz means the SRAM can deliver data within roughly half a clock cycle. That margin absorbs PCB trace delay and output loading without a wait state.
Officially obsolete. No last-time-buy window remains open from Cypress (Infineon). Available through independent distribution and surplus channels. Sourced to order against an RFQ.
This part belongs in indoor, temperature-controlled equipment: telecom switches, base stations, network routers, or test equipment that lives in a rack or lab.