64 Mbit NOR Flash with Quad-SPI at 108 MHz
The Infineon S25FL064LABNFV041 is a 64 Mbit FLASH - NOR memory from the FL-L series, organized as 8M x 8 bits. It communicates over a SPI interface that supports Quad I/O and QPI protocols, reaching a clock frequency of 108 MHz.
At 108 MHz with Quad I/O, this part delivers a sustained read throughput that keeps a Cortex-M core fed without wait-state stalls on the external bus. The QPI mode reduces the command overhead by using a single-wire opcode, so back-to-back reads from sequential addresses see minimal dead cycles. If your bootloader or firmware storage sits on this flash, the 108 MHz clock lets you size the SPI prescaler for a clean margin at 3.3 V signal levels.
Supply range and interface compatibility
The Quad I/O interface uses four data lines plus clock and chip-select, so the layout needs six traces routed with matched length within a few mm to avoid skew at 108 MHz. The QPI mode halves the command pin count to one, useful when you are tight on GPIO on the host MCU.
No last-time-buy risk is indicated for this part.