Cypress Semiconductor's S25FL216K0PMFI011 is a 16 Mbit SPI NOR Flash memory from the FL2-K series, organized as 2M x 8 and operating from a 2.7V to 3.6V supply. It supports SPI with dual I/O at a 65 MHz clock and is housed in an 8-SOIC package. Cypress has designated this part as Obsolete.
65 MHz dual-I/O SPI — bus margin for code shadowing
The 65 MHz clock rate with dual-I/O reads at an effective 130 MHz data rate on the bus. That is enough headroom for code shadow or data logging in a Cortex-M class system without wait-state tuning. The 5 ms page write time is typical for this density — budget it in the firmware's write routine to avoid a timeout.
The supply range down to 2.7V means the part holds its contents through a 3.3V rail droop to 2.7V — useful in battery-backed or lightly regulated designs. At 2.7V the 65 MHz clock is still guaranteed; no derating needed.