128 Mbit NOR Flash — SPI Quad I/O at 80 MHz
The S25FL128SDSMFB000 is a 128 Mbit (16M x 8) NOR Flash from Infineon's FL-S series, organized as 16M x 8 and accessed via an SPI Quad I/O interface running at 80 MHz. This is a non-volatile memory part suited for code shadowing, firmware storage, and data logging in embedded systems where fast read throughput and reliable retention over temperature are required.
16-SOIC footprint — board integration notes
The wide body gives good clearance for routing the SPI bus lines — the Quad I/O interface uses four data lines plus clock and chip-select, so the 16-pin count keeps the fan-out manageable on a two-layer board. The 80 MHz clock rate means the SPI bus rise times are in the 2-3 ns range; keep the trace length under 100 mm and add a series termination resistor (22 Ω typical) near the source to damp reflections. Decouple with a 100 nF ceramic within 5 mm of each VCC pin.